├── L2-Variables.php
├── test.txt
├── test2.txt
├── L28-request-response.php
├── File inclusion
    ├── footer.php
    ├── index.php
    └── header.php
├── uploads
    └── IMG-668f948d0b4a3.pdf
├── session
    ├── logout.php
    ├── index.php
    └── login.php
├── L6-Uses_of_Quotes.php
├── L5-comments.php
├── L4-Constants.php
├── L21-File-inclusion.php
├── L24-Error-Handling.php
├── hw
    ├── first homework
    │   ├── protikha
    │   │   ├── ass-6.php
    │   │   ├── ass-3.php
    │   │   ├── ass-5.php
    │   │   ├── ass-7.php
    │   │   ├── ass-4.php
    │   │   ├── ass-1.php
    │   │   └── ass-2.php
    │   └── AIMAN PHP Homework 1
    │   │   ├── L6_odd_even.php
    │   │   ├── L3_vote_eligible.php
    │   │   ├── L7_string_int_checker.php
    │   │   ├── L5_positive_checker.php
    │   │   ├── L4_marriage_eligible.php
    │   │   ├── L1_electric_bill.php
    │   │   └── L2_calculator.php
    └── protikha6-06-2024
    │   └── homework.php
├── L1-echo.php
├── L10-Loops.php
├── L23-try-catch-throw-finally.php
├── L15-function.php
├── L13-random-pass.php
├── L26-JSON.php
├── L22-Sending-mail.php
├── L18-2-methods.php
├── L3-Data_types.php
├── L14-strings.php
├── L7-operators.php
├── L8-Mathematical_functions.php
├── L16-regular-expression.php
├── L31-opp-class.php
├── L20-file-upload.php
├── L18-1-superglobals.php
├── L25- Date-Time.php
├── L32-oop-part-2.php
├── L27-File-system.php
├── L9-Control_Statements.php
├── L29-crud.php
├── L12-Array-functions.php
├── L30-session.php
├── L11-Arrays.php
├── L33-oop-part-3.php
├── L17-problem-solving.php
└── L19-form-validation.php


/L2-Variables.php:
--------------------------------------------------------------------------------
1 | <?php  
2 |     $x123 = 123;
3 | ?>


--------------------------------------------------------------------------------
/test.txt:
--------------------------------------------------------------------------------
1 | Hello World
2 | Hello PHP
3 | Hello Laravel


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/test2.txt:
--------------------------------------------------------------------------------
1 | Hello World
2 | Hello PHP
3 | Hello Laravel


--------------------------------------------------------------------------------
/L28-request-response.php:
--------------------------------------------------------------------------------
1 | <?php  
2 |     echo $_GET["msg"];
3 | ?>


--------------------------------------------------------------------------------
/File inclusion/footer.php:
--------------------------------------------------------------------------------
1 | <footer>Footer</footer>
2 | </body>
3 | </html>


--------------------------------------------------------------------------------
/uploads/IMG-668f948d0b4a3.pdf:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/asif-daffodil/B83mPHP/HEAD/uploads/IMG-668f948d0b4a3.pdf


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/session/logout.php:
--------------------------------------------------------------------------------
1 | <?php  
2 |     session_start();
3 |     session_unset();
4 |     header('location:login.php');
5 | ?>


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/L6-Uses_of_Quotes.php:
--------------------------------------------------------------------------------
1 | <?php  
2 |     $city = "Dhaka";
3 |     echo "Hello, $city<br>";
4 |     echo 'Hello, $city<br>';
5 | ?>


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/L5-comments.php:
--------------------------------------------------------------------------------
1 | <?php  
2 |     // single line comment
3 |     # single line comment
4 |     /*
5 |         multi 
6 |         line 
7 |         comment
8 |     */
9 | ?>


--------------------------------------------------------------------------------
/File inclusion/index.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     require_once('header.php');
 3 | ?>
 4 | 
 5 | <h1>Home page</h1>
 6 | 
 7 | <?php  
 8 |     require_once('footer.php');
 9 | ?>
10 | 
11 |     


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/L4-Constants.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 |     $x = 123;
 3 |     echo $x."<br>";
 4 | 
 5 |     $x = 231;
 6 | 
 7 |     define("x", 321);
 8 | 
 9 |     echo $x."<br>";
10 |     echo x."<br>";
11 | ?>


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/L21-File-inclusion.php:
--------------------------------------------------------------------------------
1 | <?php  
2 |     require_once("./File%20inclusion/header.php");
3 | ?>
4 | 
5 | <h2>Page Content</h2>
6 | 
7 | <?php  
8 |     require_once("./File%20inclusion/footer.php");
9 | ?>


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/L24-Error-Handling.php:
--------------------------------------------------------------------------------
1 | <?php  
2 |     ini_set('display_errors', 1);
3 |     // Error Handling
4 |     if(5 < 10){
5 |         trigger_error('This is an error', E_USER_ERROR);
6 |     echo "Hello World<br>";
7 |     }
8 | ?>
9 | 


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/hw/first homework/protikha/ass-6.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function checkOddEven($num) {
 3 |     if ($num % 2 == 0) {
 4 |         return "Even";
 5 |     } else {
 6 |         return "Odd";
 7 |     }
 8 | }
 9 | 
10 | echo checkOddEven(7) . "\n";
11 | 


--------------------------------------------------------------------------------
/L1-echo.php:
--------------------------------------------------------------------------------
 1 | <?php 
 2 |     echo "Hello, World!<br>", "Hi, PHP!<br>";
 3 |     // print "ha ha ha", "he he he";
 4 | 
 5 |     if(print("Hello, World war 2!<br>")) {
 6 |         echo "Hello, World!<br>";
 7 |     }
 8 | 
 9 |     var_dump(123);
10 | 


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/hw/first homework/AIMAN PHP Homework 1/L6_odd_even.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 |  function oddEvenChecker($number) {
 3 |     if ($number %2 == 0) {
 4 |         return "Even number";
 5 |     }else {
 6 |         return "Odd number";
 7 |     }
 8 | }
 9 | 
10 | echo oddEvenChecker(11);
11 | ?>


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/hw/first homework/protikha/ass-3.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function checkVoterEligibility($age) {
 3 |     if ($age >= 18) {
 4 |         return "Eligible to vote";
 5 |     } else {
 6 |         return "Not eligible to vote";
 7 |     }
 8 | }
 9 | 
10 | echo checkVoterEligibility(25) . "\n";
11 | 


--------------------------------------------------------------------------------
/L10-Loops.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     $x = 0;
 3 |     while($x < 10){
 4 |         echo $x;
 5 |         $x++;
 6 |     }
 7 |     echo "<br>";
 8 | 
 9 |     for($i = 0; $i < 5000; $i++){
10 |         if($i >= 533 && $i % 533 == 0){
11 |             echo $i."<br>";
12 |         }
13 |     }
14 | ?>


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/hw/first homework/protikha/ass-5.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function checkNumber($num) {
 3 |     if ($num > 0) {
 4 |         return "Positive";
 5 |     } elseif ($num < 0) {
 6 |         return "Negative";
 7 |     } else {
 8 |         return "Zero";
 9 |     }
10 | }
11 | 
12 | echo checkNumber(-5) . "\n";
13 | 


--------------------------------------------------------------------------------
/hw/first homework/protikha/ass-7.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function checkDataType($data) {
 3 |     if (is_numeric($data)) {
 4 |         return "Integer";
 5 |     } else {
 6 |         return "String";
 7 |     }
 8 | }
 9 | 
10 | echo checkDataType("hello") . "\n";
11 | echo checkDataType(5) . "\n";
12 | 
13 | 
14 | 


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/hw/first homework/AIMAN PHP Homework 1/L3_vote_eligible.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 |  function voterEligibilityChecker($age) {
 3 | 
 4 |     if ($age >= 18){
 5 |         return "Eligible to vote";
 6 |     }else {
 7 |         return "Uneligible to Vote";
 8 |     }
 9 | }
10 | 
11 |  echo voterEligibilityChecker(43);
12 | ?>


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/session/index.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     session_start();
 3 |     if(!isset($_SESSION['name'])){
 4 |         header('location:login.php');
 5 |     }
 6 | ?>
 7 | <h2>Welcome</h2>
 8 | <h3>Your name is : <?= $_SESSION['name'] ?> and your city is : <?= $_SESSION['city'] ?></h3>
 9 | <br>
10 | <a href="logout.php">Logout</a>


--------------------------------------------------------------------------------
/File inclusion/header.php:
--------------------------------------------------------------------------------
 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 | <head>
 4 |     <meta charset="UTF-8">
 5 |     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 6 |     <title>Document</title>
 7 | </head>
 8 | <body>
 9 |     <header>
10 |         Header
11 |         <nav>Navbar</nav>
12 |     </header>


--------------------------------------------------------------------------------
/L23-try-catch-throw-finally.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 | $x = 3;
 3 |     try{
 4 |         if($x >= 5){
 5 |             throw new Exception('This is an exception');
 6 |         }
 7 |         echo 'This is not an exception<br>';
 8 |     }catch(Exception $e){
 9 |         echo 'Message: '.$e->getMessage()."<br>";
10 |     }finally{
11 |         echo 'Finally block';
12 |     }
13 | 
14 | ?>


--------------------------------------------------------------------------------
/hw/first homework/AIMAN PHP Homework 1/L7_string_int_checker.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 |  function checkDataType($data) {
 3 |     if (is_int($data)) {
 4 |         return "Integer Data Type";
 5 |     } elseif (is_string($data)) {
 6 |         return "String Data Type";
 7 |     } else {
 8 |         return "Not int or str";
 9 |     }
10 | }
11 | 
12 | echo checkDataType("China");
13 | 
14 | ?>


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/hw/first homework/AIMAN PHP Homework 1/L5_positive_checker.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 |  function positiveChecker($number) {
 3 |     if(!is_numeric($number)) {
 4 |         return "Invalid Input";
 5 |     }
 6 |     if ($number >= 0) {
 7 |         return "The number is positive";
 8 |     }else {
 9 |         return "The number is negative";
10 |     }
11 | }
12 | 
13 | echo positiveChecker(-21);
14 | 
15 | ?>


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/L15-function.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     function shoeMyName ($myFirstName = "Hello", $myLastName = "dude"){
 3 |         return "$myFirstName $myLastName<br>";
 4 |     }
 5 | 
 6 |     echo shoeMyName("Protikkha", "Tanwi");
 7 |     echo shoeMyName("Aiman", "Ghazi");
 8 |     echo shoeMyName();
 9 |     echo shoeMyName("Mujhaid");
10 |     echo shoeMyName(myLastName:"Boyati", myFirstName:"Mujhaid");
11 | ?>


--------------------------------------------------------------------------------
/hw/first homework/protikha/ass-4.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function checkMarriageEligibility($age, $gender) {
 3 |     if ($age >= 21 && $gender == 'male') {
 4 |         return "Eligible for marriage";
 5 |     } elseif ($age >= 18 && $gender == 'female') {
 6 |         return "Eligible for marriage";
 7 |     } else {
 8 |         return "Not eligible for marriage";
 9 |     }
10 | }
11 | 
12 | echo checkMarriageEligibility(20, 'male') . "\n";
13 | 


--------------------------------------------------------------------------------
/L13-random-pass.php:
--------------------------------------------------------------------------------
 1 | <?php 
 2 |     $capAlpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 3 |     $smallAlpha = "abcdefghijklmnopqrstuvwxyz";
 4 |     $numbers = "0123456789";
 5 |     $specialChars = "!@#$%^&*()_+{}|:<>?";
 6 | 
 7 |     echo str_shuffle(substr(str_shuffle($capAlpha), -2).substr(str_shuffle($smallAlpha), -2).substr(str_shuffle($numbers), -2).substr(str_shuffle($specialChars), -2).uniqid().rand(1000, 9999));
 8 | 
 9 |     // numeric functions
10 |     
11 | ?>


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/hw/first homework/AIMAN PHP Homework 1/L4_marriage_eligible.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 |  function marriageEligibilityChecker($gender, $age) {
 3 | 
 4 |     if (($gender == 'Male') && ($age >=21)){
 5 |         return "Man is eligible to marry";
 6 |     }elseif (($gender == 'Female') && ($age >=18)){
 7 |         return "Woman is eligible to marry";
 8 |     }else {
 9 |         return "Ineligible to marry";
10 |     }
11 | }
12 | 
13 |  echo marriageEligibilityChecker('Female', 25);
14 | ?>


--------------------------------------------------------------------------------
/L26-JSON.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 | 
 3 |     // Associative array
 4 |     $arr = [
 5 |         'name' => 'Abir',
 6 |         'age' => 25,
 7 |         'city' => 'Dhaka',
 8 |         'country' => 'Bangladesh'
 9 |     ];
10 | 
11 |     echo json_encode($arr)."<br>";
12 | 
13 |     // json
14 |     $json = '{"name":"Abir","age":25,"city":"Dhaka","country":"Bangladesh"}';
15 |     $arr = json_decode($json, true);
16 |     echo "<pre>";
17 |     print_r($arr);
18 |     echo "</pre>";
19 | 
20 | ?>


--------------------------------------------------------------------------------
/hw/first homework/protikha/ass-1.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function calculateElectricBill($units) {
 3 |     if ($units <= 50) {
 4 |         return $units * 3.50;
 5 |     } elseif ($units <= 150) {
 6 |         return (50 * 3.50) + (($units - 50) * 4.00);
 7 |     } elseif ($units <= 250) {
 8 |         return (50 * 3.50) + (100 * 4.00) + (($units - 150) * 5.20);
 9 |     } else {
10 |         return (50 * 3.50) + (100 * 4.00) + (100 * 5.20) + (($units - 250) * 6.50);
11 |     }
12 | }
13 | 
14 | echo "Electricity bill for 200 units: " . calculateElectricBill(200) . " tk\n";
15 | 


--------------------------------------------------------------------------------
/hw/first homework/AIMAN PHP Homework 1/L1_electric_bill.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function calculateBill($units) {
 3 |     $bill = 0;
 4 |     
 5 |     if ($units <= 50) {
 6 |         $bill = $units * 3.50;
 7 |     } else if ($units <= 150) {
 8 |         $bill = (50 * 3.50) + (($units - 50) * 4.00);
 9 |     } else if ($units <= 250) {
10 |         $bill = (50 * 3.50) + (100 * 4.00) + (($units - 150) * 5.20);
11 |     } else {
12 |         $bill = (50 * 3.50) + (100 * 4.00) + (100 * 5.20) + (($units - 250) * 6.50);
13 |     }
14 |     
15 |     return $bill;
16 | }
17 | 
18 | echo calculateBill(143);
19 | 
20 | ?>


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/L22-Sending-mail.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     // mail
 3 |     if(isset($_POST['submit'])){
 4 |         $to = 'lecturer1@dipti.com.bd';
 5 |         $subject = 'Test mail';
 6 |         $message = 'Hello, this is a test mail';
 7 |         $headers = 'From:abir@dipti.com.bd';
 8 | 
 9 |         $sendMail = mail($to, $subject, $message, $headers);
10 | 
11 |         if($sendMail){
12 |             echo 'Mail sent successfully';
13 |         }else{
14 |             echo 'Mail sent failed';
15 |         }
16 |     }
17 | ?>
18 | 
19 | <form action="" method="post">
20 |     <input type="submit" name="submit" value="Send Mail">
21 | </form>


--------------------------------------------------------------------------------
/session/login.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     session_start();
 3 | 
 4 |     if(isset($_SESSION['name'])){
 5 |         header('location:index.php');
 6 |     }
 7 | 
 8 |     if(isset($_POST['login'])){
 9 |         $_SESSION['name'] = $_POST['name'];
10 |         $_SESSION['city'] = $_POST['city'];
11 |         header('location:index.php');
12 |     }
13 | ?>
14 | <h1>Login Form</h1>
15 | <form action="" method="post">
16 |     <input type="text" placeholder="Your name" name="name" required>
17 |     <br><br>
18 |     <input type="text" placeholder="Your City" name="city" required>
19 |     <br><br>
20 |     <button type="submit" name="login">Login</button>
21 | </form>


--------------------------------------------------------------------------------
/L18-2-methods.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     // echo $_REQUEST['msg']." ".$_REQUEST['alert'];
 3 |     // echo $_GET['msg']." ".$_GET['alert'];
 4 |     // $finalMsg = null;
 5 |     if(isset($_POST['msg']) && isset($_POST['alert'])){
 6 |         $finalMsg = $_POST['msg']." ".$_POST['alert'];
 7 |     }
 8 | ?>
 9 | 
10 | <form action="" method="post">
11 |     <input type="text" name="msg">
12 |     <input type="text" name="alert">
13 |     <button type="submit">Show Message</button>
14 | </form>
15 | 
16 | <?php  
17 |     // echo $_REQUEST['msg'] ?? null;
18 |     // echo $_GET['msg'] ?? null;
19 |     // echo $_POST['msg'] ?? null;
20 |     echo $finalMsg ?? null;
21 | ?>


--------------------------------------------------------------------------------
/hw/first homework/AIMAN PHP Homework 1/L2_calculator.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 |  function calculator($val1, $val2, $operator) {
 3 |     $output = 0;
 4 |     
 5 |     switch($operator) {
 6 |         case 'addition':
 7 |             $output = $val1 + $val2;
 8 |             break;
 9 |         case 'subtraction':
10 |             $output = $val1 - $val2;
11 |             break;
12 |         case 'multiplication':
13 |             $output = $val1 * $val2;
14 |             break;
15 |         case 'division':
16 |             $output = $val1 / $val2;
17 |             break;
18 |         default:
19 |             return "Invalid Input";
20 |     }
21 |     
22 |     return $output;
23 | }
24 | 
25 | echo calculator(4, 5, 'addition');
26 | 
27 | ?>


--------------------------------------------------------------------------------
/L3-Data_types.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     var_dump("ha ha ha");
 3 |     echo "<br>";
 4 |     var_dump(123);
 5 |     echo "<br>";
 6 |     var_dump(123.123);
 7 |     echo "<br>";
 8 |     var_dump(true);
 9 |     echo "<br>";
10 |     var_dump([1, 2, 3]);
11 |     echo "<br>";
12 |     var_dump(null);
13 |     echo "<br>";
14 |     class students {
15 |         public $name = "Protikkha";
16 |         private $age = 21;
17 |         protected $roll = 123;
18 | 
19 |         public function herAge () {
20 |             return $this->age;
21 |         }
22 |     }
23 | 
24 |     class childOfStudent extends students {
25 |         public function herRoll () {
26 |             return $this->roll;
27 |         }
28 |     }
29 |     $student = new students;
30 |     var_dump($student);
31 | 
32 |     // resource
33 | ?>


--------------------------------------------------------------------------------
/hw/first homework/protikha/ass-2.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function calculator($operator, $num1, $num2) {
 3 |     switch ($operator) {
 4 |         case 'add':
 5 |             return $num1 + $num2;
 6 |         case 'subtract':
 7 |             return $num1 - $num2;
 8 |         case 'multiply':
 9 |             return $num1 * $num2;
10 |         case 'divide':
11 |             if ($num2 != 0) {
12 |                 return $num1 / $num2;
13 |             } else {
14 |                 return "Cannot divide by zero!";
15 |             }
16 |         default:
17 |             return "Invalid operator";
18 |     }
19 | }
20 | 
21 | echo "Addition: " . calculator('add', 5, 3) . "\n";
22 | echo "Subtraction: " . calculator('subtract', 5, 3) . "\n";
23 | echo "Multiplication: " . calculator('multiply', 5, 3) . "\n";
24 | echo "Division: " . calculator('divide', 5, 3) . "\n";
25 | 


--------------------------------------------------------------------------------
/L14-strings.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     $fname = "Protikkha";
 3 |     $lname = "Tanwi";
 4 | 
 5 |     // echo $fname . " " . $lname . "<br>";
 6 | 
 7 |     $ss = "Mujhaid";
 8 |     $ss .= " Boyati";
 9 | 
10 |     echo $ss;
11 | 
12 |     // Trimming strings
13 |     $str = "    Hello World    ";
14 |     echo "<br>" . trim($str) . "<br>";
15 | 
16 |     // Removing slashes and other harmful characters
17 |     $str = "<script>alert('Your website is hacked')</script>";
18 |     echo htmlspecialchars(stripslashes($str));
19 | 
20 |     // String functions
21 |     echo "<br>" . strlen($fname) . "<br>";
22 |     echo str_word_count($fname) . "<br>";
23 |     echo strrev($fname) . "<br>";
24 |     echo strpos($fname, "t") . "<br>";
25 |     echo str_replace("Protikkha", "Protikkha Tanwi", $fname) . "<br>";
26 |     //  substr
27 |     echo substr($fname, 0, 4) . "<br>";
28 |     // str_shuffle
29 |     echo str_shuffle($fname) . "<br>";
30 | 
31 | ?>


--------------------------------------------------------------------------------
/L7-operators.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     // Arithmetic operators
 3 |     /**
 4 |      * +
 5 |      * -
 6 |      * *
 7 |      * /
 8 |      * %
 9 |      */
10 | 
11 |      // Assignment operators
12 |      /**
13 |       * =
14 |       * +=
15 |       * -=
16 |       * *=
17 |       * /=
18 |       * %=
19 |       */
20 | 
21 |      $x = 2;
22 |      $x += 3; 
23 |      $x -= 2; 
24 |      $x *= 3;
25 |      $x /= 3; 
26 |      $x %= 2;  
27 |      echo $x."<br>";
28 | 
29 |     //   Logical operators
30 |     /**
31 |      * &&
32 |      * ||
33 |      * and
34 |      * or
35 |      * !
36 |      */
37 | 
38 |     // Comparisons
39 |     /**
40 |      * ==
41 |      * ===
42 |      * !=
43 |      * !==
44 |      * >
45 |      * <
46 |      * >=
47 |      * <=
48 |      */
49 | 
50 |     // Operator precedence
51 |     /**
52 |      * ()
53 |      * **
54 |      * * / %
55 |      * + -
56 |      * = += -= *= /=
57 |      * and or
58 |      * && ||
59 |      * == === != !== > < >= <=
60 |      */
61 | 
62 |     echo (2 + 3)**2 * 2;
63 | ?>


--------------------------------------------------------------------------------
/L8-Mathematical_functions.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 |     // Mathematical functions
 3 |     /**
 4 |      * abs()
 5 |      * sqrt()
 6 |      * pow()
 7 |      * exp()
 8 |      * log()
 9 |      * log10()
10 |      * sin()
11 |      * cos()
12 |      * tan()
13 |      * asin()
14 |      * acos()
15 |      * atan()
16 |      * rand()
17 |      * min()
18 |      * max()
19 |      * round()
20 |      * ceil()
21 |      * floor()
22 |      */
23 | 
24 |     echo abs(-100)."<br>";
25 |     echo sqrt(100)."<br>";
26 |     echo pow(2, 3)."<br>";
27 |     
28 |     echo exp(5)."<br>";
29 |     echo log(10)."<br>";
30 |     echo log10(100)."<br>";
31 |     echo sin(90)."<br>";
32 |     echo cos(90)."<br>";
33 |     echo tan(45)."<br>";
34 |     echo asin(1)."<br>";
35 |     echo acos(1)."<br>";
36 |     echo atan(1)."<br>";
37 | 
38 |     echo rand(100000, 999999)."<br>";
39 |     echo min(0, 150, 30, 20, -8, -200)."<br>";
40 |     echo max(0, 150, 30, 20, -8, -200)."<br>";
41 |     echo round(0.60)."<br>";
42 |     echo ceil(0.10)."<br>";
43 |     echo floor(0.90)."<br>";
44 | ?>


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/L16-regular-expression.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     // Regular expression
 3 |     $str = "Hello World";
 4 |     echo preg_match("/World/", $str) . "<br>";
 5 |     echo preg_match("/world/", $str) . "<br>";
 6 |     echo preg_match("/world/i", $str) . "<br>"; // i means case insensitive
 7 |     echo preg_match("/^Hello/", $str) . "<br>"; // ^ means start
 8 |     echo preg_match("/World$/", $str) . "<br>"; // $ means end
 9 |     echo preg_match("/^Hello World$/", $str) . "<br>"; // ^ means start and $ means end
10 |     echo preg_match("/^Hello World$/i", $str) . "<br>"; // ^ means start and $ means end
11 |     echo preg_match("/^Hello W\w+$/i", $str) . "<br>"; // \w+ means one or more word characters
12 |     echo preg_match("/^Hello W\w{1,5}$/i", $str) . "<br>"; // \w{1,5} means one to five word characters
13 |     // \d means one digit
14 |     //  example: \d{1,5} means one to five digits
15 |     // \s means one whitespace
16 |     //  example: \s{1,5} means one to five whitespaces
17 |     // \b means word boundary
18 |     //  example: \bHello\b means Hello word boundary
19 |     // /^[A-Za-z]*$/


--------------------------------------------------------------------------------
/L31-opp-class.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     class myInfo {
 3 |         // properties
 4 |         public $myName = "Asif Abir";
 5 |         public $myCity = "Dhaka";
 6 | 
 7 |         // methods
 8 |         public function myDetails() {
 9 |             return "My name is ".$this->myName." and I live in ".$this->myCity;
10 |         }
11 | 
12 |         public function __construct($msg) {
13 |             echo $msg."<br>";
14 |         }
15 | 
16 |         public function __destruct() {
17 |             echo "This is a destructor function";
18 |         }
19 |     } 
20 | 
21 |     //  instantiate the class | create object
22 |     $myObj = new myInfo("Hello World");
23 |     $myObj->myName = "Asif";
24 |     echo $myObj->myDetails();
25 |     echo "<br>";
26 | 
27 |     // inheritance
28 |     class myChildInfo extends myInfo {
29 |         public $myChildName = "Asifa Amrin";
30 | 
31 |         public function myChildDetails() {
32 |             return "My elder child name is ".$this->myChildName." and she lives in ".$this->myCity;
33 |         }
34 | 
35 |         public function __construct() {
36 |             return ;
37 |         }
38 | 
39 |         public function __destruct() {
40 |             return ;
41 |         }
42 |     }
43 | 
44 |     $myChildObj = new myChildInfo;
45 |     echo $myChildObj->myChildDetails();
46 |     echo "<br>";
47 | ?>


--------------------------------------------------------------------------------
/L20-file-upload.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     if(isset($_POST['submit'])){
 3 |         $fileName = $_FILES['file']['name'];
 4 |         $fileTmpName = $_FILES['file']['tmp_name'];
 5 |         $fileSize = $_FILES['file']['size'];
 6 |         $extNameArr = explode('.',$fileName);
 7 |         $fileExt = strtolower(end($extNameArr));
 8 |         $allowed = ['jpg','jpeg','png','pdf'];
 9 | 
10 |         if(empty($fileName)){
11 |             $msg = "<span style='color: red'>Please choose a file</span>";
12 |         }elseif(!in_array($fileExt, $allowed)){
13 |             $msg = "<span style='color: red'>Please choose a valid file</span>";
14 |         }elseif($fileSize > 2000000){
15 |             $msg = "<span style='color: red'>File size is too large</span>";
16 |         }else{
17 |             $newFileName = uniqid('IMG-', false).'.'.$fileExt;
18 |             $uploadPath = 'uploads/'.$newFileName;
19 |             $move = move_uploaded_file($fileTmpName, $uploadPath);
20 |             if($move){
21 |                 $msg = "<span style='color: green'>File uploaded successfully</span>";
22 |             }else{
23 |                 $msg = "<span style='color: red'>File upload failed</span>";
24 |             }
25 |         }
26 |     }
27 | ?>
28 | 
29 | <form action="" method="post" enctype="multipart/form-data" >
30 |     <input type="file" name="file" >
31 |     <input type="submit" name="submit" value="Upload" >
32 | </form>
33 | <?= $msg ?? null ?>


--------------------------------------------------------------------------------
/L18-1-superglobals.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     // Superglobals
 3 |     // $GLOBALS
 4 |     $x = 5;
 5 |     $y = 10;
 6 |     function sum(){
 7 |         $GLOBALS['z'] = $GLOBALS['x'] + $GLOBALS['y'];
 8 |     }
 9 |     sum();
10 |     echo $z."<br>";
11 | 
12 |     // $_SERVER
13 |     echo $_SERVER['PHP_SELF']."<br>";
14 |     echo $_SERVER['SERVER_NAME']."<br>";
15 |     echo $_SERVER['HTTP_HOST']."<br>";
16 |     echo $_SERVER['HTTP_USER_AGENT']."<br>";
17 |     echo $_SERVER['SCRIPT_NAME']."<br>";
18 |     // get user ip address
19 |     echo $_SERVER['REMOTE_ADDR']."<br>";
20 |     // get server ip address
21 |     echo $_SERVER['SERVER_ADDR']."<br>";
22 |     echo "<pre>";
23 |     print_r($_SERVER);
24 |     echo "</pre>";
25 | 
26 |     // $_REQUEST
27 |     echo $_REQUEST['name']."<br>";
28 |     echo $_REQUEST['email']."<br>";
29 | 
30 |     // $_POST
31 |     echo $_POST['name']."<br>";
32 |     echo $_POST['email']."<br>";
33 | 
34 |     // $_GET
35 |     echo $_GET['name']."<br>";
36 |     echo $_GET['email']."<br>";
37 | 
38 |     // $_FILES
39 |     echo $_FILES['file']['name']."<br>";
40 |     echo $_FILES['file']['type']."<br>";
41 |     echo $_FILES['file']['tmp_name']."<br>";
42 |     echo $_FILES['file']['error']."<br>";
43 |     echo $_FILES['file']['size']."<br>";
44 | 
45 |     // $_ENV
46 |     echo $_ENV['USER']."<br>";
47 | 
48 |     // $_COOKIE
49 |     echo $_COOKIE['user']."<br>";
50 | 
51 |     // $_SESSION
52 |     session_start();
53 |     $_SESSION['user'] = "John Doe";
54 |     echo $_SESSION['user']."<br>";
55 | ?>


--------------------------------------------------------------------------------
/L25- Date-Time.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     date_default_timezone_set('Asia/Dhaka');
 3 |     echo date('d-m-y h:i:s a D')."<br>";
 4 |     echo date('d-M-Y H:i:s A l')."<br>";
 5 |     echo date('d-F-Y h:i:s a l')."<br>";
 6 | 
 7 |     //  mktime(hour, minute, second, month, day, year)
 8 |     $timestamp = mktime(10, 30, 45, 9, 10, 2024);
 9 |     echo date('d-M-Y h:i:s a l', $timestamp)."<br>";
10 | 
11 |     // strtotime(time, now)
12 |     $timestamp = strtotime('tomorrow');
13 |     echo date('d-M-Y h:i:s a l', $timestamp)."<br>";
14 |     $timestamp = strtotime('next Friday');
15 |     echo date('d-M-Y h:i:s a l', $timestamp)."<br>";
16 |     $timestamp = strtotime('+5 years 4 months +2 days');
17 |     echo date('d-M-Y h:i:s a l', $timestamp)."<br>";
18 | 
19 |     // next 7 friday
20 |     $startDay = strtotime('next Friday');
21 |     $endDay = strtotime('+6 weeks', $startDay);
22 |     while($startDay <= $endDay){
23 |         echo date('d-M-Y l', $startDay)."<br>";
24 |         $startDay = strtotime('+1 week', $startDay);
25 |     }
26 | 
27 |     // DateTime
28 |     $date = new DateTime();
29 |     echo $date->format('d-M-Y h:i:s a l')."<br>";
30 |     $date = new DateTime('2020-12-25');
31 |     echo $date->format('d-M-Y h:i:s a l')."<br>";
32 |     $date = new DateTime('2020-12-25 10:30:45');
33 |     echo $date->format('d-M-Y h:i:s a l')."<br>";
34 | 
35 |     $date1 = new DateTime("2020-12-25");
36 |     $date2 = new DateTime("2024-9-10");
37 |     $diff = $date1->diff($date2);
38 |     echo $diff->format('%y years %m months %d days')."<br>";
39 | ?>


--------------------------------------------------------------------------------
/L32-oop-part-2.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     abstract class aiman {
 3 |         public const name = "Aiman";
 4 |         public static int $age = 22;
 5 | 
 6 |         private function __construct() {
 7 |             return ;
 8 |         }
 9 | 
10 |         public static function aimanInfo () : string {
11 |             return "My name is ".aiman::name." and I am ".aiman::$age." years old \n";
12 |         }
13 | 
14 |         abstract protected static function myAbstractFunction(string $name = "Abdul", int $age = 35): string;
15 | 
16 |     }
17 | 
18 |     aiman::$age = 23;
19 |     echo aiman::aimanInfo();
20 | 
21 |     interface aimanInterface {
22 |         public static function aimanInterfaceFunction(string $msg = "Hello World") : string;
23 |     }
24 | 
25 |     trait aimanTrait {
26 |         public static function aimanTraitFunction(string $msg = "Hello World") : string {
27 |             return $msg."\n";
28 |         }
29 |     }
30 | 
31 |     class aimanChild extends aiman implements aimanInterface {
32 |         public static function myAbstractFunction(string $name = "Abdul", int $age = 35): string {
33 |             return "My name is ".$name." and I am ".$age." years old \n";
34 |         }
35 | 
36 |         public static function aimanInterfaceFunction(string $msg = "Hello World") : string {
37 |             return $msg."\n";
38 |         }
39 | 
40 |         use aimanTrait;
41 |     }
42 | 
43 |     echo aimanChild::myAbstractFunction("Ghazi", 25);
44 |     echo aimanChild::aimanInterfaceFunction("Hello Aiman Interface");
45 |     echo aimanChild::aimanTraitFunction("Hello Aiman Trait");
46 | ?>


--------------------------------------------------------------------------------
/L27-File-system.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     // basename()
 3 |     $path = $_SERVER['SCRIPT_FILENAME'];
 4 |     echo basename($path)."<br>";
 5 | 
 6 |     // dirname()
 7 |     echo dirname($path)."<br>";
 8 | 
 9 |     // copy()
10 |     copy('test.txt', 'test2.txt');
11 | 
12 |     // file()
13 |     $file = file('test.txt');
14 |     echo "<pre>";
15 |     print_r($file);
16 |     echo "</pre>";
17 | 
18 |     // file_exists()
19 |     if(file_exists('test.txt')){
20 |         echo "File exists<br>";
21 |     }
22 | 
23 |     // file_get_contents()
24 |     $data = file_get_contents('test.txt');
25 |     echo $data."<br>";
26 | 
27 |     // file_put_contents()
28 |     file_put_contents('test.txt', "Hello World\nHello PHP\nHello Laravel");
29 | 
30 |     // filesize()
31 |     echo filesize('test.txt')."<br>";
32 | 
33 |     // filetype()
34 |     echo filetype('test.txt')."<br>";
35 | 
36 |     // is_dir()
37 |     if(is_dir('./uploads')){
38 |         echo "It is a directory<br>";
39 |     }
40 | 
41 |     //  is_file()
42 |     if(is_file('test.txt')){
43 |         echo "It is a file<br>";
44 |     }
45 | 
46 |     // link()
47 |     if(is_file('test-link.txt')){
48 |         echo "File already exits<br>";
49 |     }else{
50 |         link('test.txt', 'test-link.txt');
51 |         echo "New File created<br>";
52 |     }
53 | 
54 |     // unlink()
55 |     if(is_file('test-link.txt')){
56 |         unlink('test-link.txt');
57 |         echo "File deleted<br>";
58 |     }
59 | 
60 |     // mkdir()
61 |     mkdir("test-uploads");
62 | 
63 |     // rmdir()
64 |     rmdir("test-uploads");
65 | 
66 |     // move_uploaded_file()
67 | 
68 |     // pathinfo()
69 |     $path_parts = pathinfo($path);
70 |     echo "<pre>";
71 |     print_r($path_parts);
72 |     echo "</pre>";
73 | 
74 |     // extension()
75 |     echo pathinfo($path, PATHINFO_EXTENSION)."<br>";
76 | 
77 | 
78 | ?>


--------------------------------------------------------------------------------
/L9-Control_Statements.php:
--------------------------------------------------------------------------------
 1 | <?php 
 2 |     session_start();
 3 |     $express = ["Valo", "Motamuty", "Nosto", "Valo", "Nosto", "Valo", "Nosto", "Valo", "Nosto", "Valo", "Nosto", "Motamuty", "Motamuty"];
 4 | 
 5 |     $_SESSION['lav'] = $_SESSION['lav'] ?? 0;
 6 |     $_SESSION['total'] = $_SESSION['total'] ?? 0;
 7 | 
 8 |     if($_SESSION['total'] <= (count($express) - 1)){
 9 |         if($express[rand(0, (count($express) - 1))] == "Valo"){
10 |             $_SESSION['lav'] += 10;
11 |             echo "Lav Hoise. Total Lav:".$_SESSION['lav']." <br>";
12 |         }elseif($express[rand(0, (count($express) - 1))] == "Motamuty"){
13 |             $_SESSION['lav'] += 5;
14 |             echo "Motamuty Lav Hoise. Total Lav:".$_SESSION['lav']." <br>"; 
15 |         }else{
16 |             $_SESSION['lav'] -= 10;
17 |             echo "Lav Nai :(. Total Lav: ".$_SESSION['lav']." <br>";
18 |         }
19 |         $_SESSION['total']++;
20 |     }else{
21 |         echo "Total Lav: ".$_SESSION['lav']." <br>";
22 |         session_unset();
23 |     }
24 | 
25 |     //  switch statement
26 | 
27 |     $day = "Friday";
28 | 
29 |     switch($day){
30 |         case "Saturday":
31 |             echo "Today is Saturday";
32 |             break;
33 |         case "Sunday":
34 |             echo "Today is Sunday";
35 |             break;
36 |         case "Monday":
37 |             echo "Today is Monday";
38 |             break;
39 |         case "Tuesday":
40 |             echo "Today is Tuesday";
41 |             break;
42 |         case "Wednesday":
43 |             echo "Today is Wednesday";
44 |             break;
45 |         case "Thursday":
46 |             echo "Today is Thursday";
47 |             break;
48 |         case "Friday":
49 |             echo "Today is Friday";
50 |             break;
51 |         default:
52 |             echo "Invalid Day";
53 |     }
54 | 
55 |     //  ternary operator
56 | 
57 |     if(2 == 2) {
58 |         echo "True";
59 |     }else{
60 |         echo "False";
61 |     }
62 | 
63 |     (2 == 6) ? "True" : "False";
64 | 
65 |     echo $protikha ?? "No value"; 
66 | ?>


--------------------------------------------------------------------------------
/L29-crud.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | $conn = mysqli_connect("localhost", "root", "", "b83m");
 3 | 
 4 | if(isset($_GET['del'])){
 5 |     $id = $_GET['del'];
 6 |     $delete = $conn->query("DELETE FROM `students` WHERE `id` = '$id'");
 7 |     if($delete){
 8 |         echo "<script>alert('Student deleted successfully');location.href='./L29-crud.php'</script>";
 9 |     }else{
10 |         echo "<script>alert('Failed to delete student')</script>";
11 |     }
12 | }
13 | 
14 | if (isset($_POST['addStudent'])) {
15 |     $yname = $_POST['yname'];
16 |     $insert = $conn->query("INSERT INTO `students` (`name`) VALUES ('$yname')");
17 |     if ($insert) {
18 |         echo "<script>alert('Student added successfully')</script>";
19 |     } else {
20 |         echo "<script>alert('Failed to add student')</script>";
21 |     }
22 | }
23 | 
24 | if(isset($_POST['editStudent'])){
25 |     $ename = $_POST['ename'];
26 |     $id = $_GET['edit'];
27 |     $update = $conn->query("UPDATE `students` SET `name` = '$ename' WHERE `id` = '$id'");
28 |     if($update){
29 |         echo "<script>alert('Student updated successfully');location.href='./L29-crud.php'</script>";
30 |     }else{
31 |         echo "<script>alert('Failed to update student')</script>";
32 |     }
33 | }
34 | 
35 | $select = $conn->query("SELECT * FROM `students`");
36 | 
37 | if (isset($_GET['edit'])) {
38 |     $id = $_GET['edit'];
39 |     $singleStudentInfoQuery = $conn->query("SELECT * FROM `students` WHERE `id` = '$id'");
40 |     $singleStudentInfo = $singleStudentInfoQuery->fetch_assoc();
41 | }
42 | ?>
43 | <?php if (!isset($_GET['edit'])) { ?>
44 |     <form action="" method="post">
45 |         <input type="text" placeholder="Student Name" name="yname" required>
46 |         <button type="submit" name="addStudent">Add Student</button>
47 |     </form>
48 | <?php } else { ?>
49 |     <form action="" method="post">
50 |         <input type="text" placeholder="Student Name" name="ename" required value="<?= $singleStudentInfo['name'] ?? null ?>">
51 |         <button type="submit" name="editStudent">Edit Student</button>
52 |     </form>
53 | <?php } ?>
54 | 
55 | <table border="1" cellspacing="0" cellpadding="10">
56 |     <tr>
57 |         <td>ID</td>
58 |         <td>Name</td>
59 |         <td>Action</td>
60 |     </tr>
61 |     <?php while ($row = $select->fetch_assoc()) { ?>
62 |         <tr>
63 |             <td>
64 |                 <?= $row['id'] ?>
65 |             </td>
66 |             <td>
67 |                 <?= $row['name'] ?>
68 |             </td>
69 |             <td>
70 |                 <a href="./L29-crud.php?edit=<?= $row['id'] ?>"><button>Edit</button></a>
71 |                 <a href="./L29-crud.php?del=<?= $row['id'] ?>"><button>Delete</button></a>
72 |             </td>
73 |         </tr>
74 |     <?php } ?>
75 | </table>


--------------------------------------------------------------------------------
/L12-Array-functions.php:
--------------------------------------------------------------------------------
  1 | <?php  
  2 |     // array()
  3 |     $arr = array('Dhaka', 'Barishal', 'Bogura');
  4 | 
  5 |     // is_array()
  6 |     var_dump(is_array($arr));
  7 |     echo "<br>";
  8 |     if(is_array($arr)){
  9 |         foreach($arr as $city){
 10 |             echo $city . "<br>";
 11 |         }
 12 |     }else{
 13 |         echo "We dont have any data";
 14 |     }
 15 | 
 16 |     // in_array()
 17 |     var_dump(in_array('Khulna', $arr));
 18 | 
 19 |     // array_merge()
 20 |     $arr1 = array('Dhaka', 'Noyakhali', 'Chatogram', "Bogura");
 21 | 
 22 |     $merged_arr = array_merge($arr, $arr1);
 23 |     echo "<pre>";
 24 |     print_r($merged_arr);
 25 |     echo "</pre>";
 26 | 
 27 |     // array_keys()
 28 |     $studentInfo = ["name" => "Rakib", "age" => 23, "isStudent" => true, "cgpa" => 3.5];
 29 |     $keys = array_keys($studentInfo);
 30 |     echo "<pre>";
 31 |     print_r($keys);
 32 |     echo "</pre>";
 33 | 
 34 |     // array_key_exists()
 35 |     var_dump(array_key_exists('city', $studentInfo));
 36 | 
 37 |     // array_shift()
 38 |     array_shift($merged_arr);
 39 |     echo "<pre>";
 40 |     print_r($merged_arr);
 41 |     echo "</pre>";
 42 | 
 43 |     // array_unshift()
 44 |     array_unshift($merged_arr, 'Kuyakata', 'Coxs Bazar');
 45 |     echo "<pre>";
 46 |     print_r($merged_arr);
 47 |     echo "</pre>";
 48 | 
 49 |     // array_push()
 50 |     array_push($merged_arr, 'Kuyakata', 'Coxs Bazar');
 51 |     echo "<pre>";
 52 |     print_r($merged_arr);
 53 |     echo "</pre>";
 54 | 
 55 |     // array_pop()
 56 |     array_pop($merged_arr);
 57 |     echo "<pre>";
 58 |     print_r($merged_arr);
 59 |     echo "</pre>";
 60 | 
 61 |     // array_values()
 62 |     $values = array_values($studentInfo);
 63 |     echo "<pre>";
 64 |     print_r($values);
 65 |     echo "</pre>";
 66 | 
 67 |     // array_map()
 68 |     function showCity($city){
 69 |         if(strlen($city) <= 6){
 70 |             return $city;
 71 |         }
 72 |     }
 73 |     $cityList = array_map('showCity', $merged_arr);
 74 |     echo "<pre>";
 75 |     print_r($cityList);
 76 |     echo "</pre>";
 77 | 
 78 |     // array_unique()
 79 |     $uniqueCities = array_unique($merged_arr);
 80 |     echo "<pre>";
 81 |     print_r($uniqueCities);
 82 |     echo "</pre>";
 83 | 
 84 |     // array_slice()
 85 |     $slicedCities = array_slice($uniqueCities, 2, 3);
 86 |     echo "<pre>";
 87 |     print_r($slicedCities);
 88 |     echo "</pre>";
 89 | 
 90 |     // array_diff()
 91 |     $diff = array_diff($arr1, $arr);
 92 |     echo "<pre>";
 93 |     print_r($diff);
 94 |     echo "</pre>";
 95 | 
 96 |     // array_search()
 97 |     var_dump(array_search('Brammonbaria', $arr1));
 98 | 
 99 |     // array_reverse()
100 |     $reversedCities = array_reverse($uniqueCities);
101 |     echo "<pre>";
102 |     print_r($reversedCities);
103 |     echo "</pre>";
104 | 
105 | 


--------------------------------------------------------------------------------
/L30-session.php:
--------------------------------------------------------------------------------
 1 | <?php  
 2 |     session_start();
 3 |     $conn = mysqli_connect("localhost", "root", "", "83m_session");
 4 | 
 5 |     if(isset($_POST['register'])){
 6 |         $ruserName = $_POST['ruserName'];
 7 |         $rpassword = $_POST['rpassword'];
 8 | 
 9 |         $check_username = $conn->query("SELECT * FROM `users` WHERE `user_name` = '$ruserName'");
10 |         if($check_username->num_rows > 0){
11 |             echo "<script>alert('User name already exists')</script>";
12 |         }else{
13 |             $rpassword = md5($rpassword);
14 |             $insert = $conn->query("INSERT INTO `users` (`user_name`, `password`) VALUES ('$ruserName', '$rpassword')");
15 |             if($insert){
16 |                 echo "<script>alert('User registered successfully')</script>";
17 |             }else{
18 |                 echo "<script>alert('Failed to register user')</script>";
19 |             }
20 |         }
21 |     }
22 | 
23 |     if(isset($_POST['login'])){
24 |         $userName = $_POST['userName'];
25 |         $password = $_POST['password'];
26 |         $password = md5($password);
27 | 
28 |         $check_user = $conn->query("SELECT * FROM `users` WHERE `user_name` = '$userName' AND `password` = '$password'");
29 | 
30 |         if ($check_user->num_rows == 1) {
31 |             $_SESSION['user'] = $userName;
32 |             echo "<script>alert('Login successful');location.href='./L30-session.php'</script>";
33 |         }else{
34 |             echo "<script>alert('Invalid username or password')</script>";
35 |         }
36 |     }
37 | 
38 |     if(isset($_GET['logout'])){
39 |         session_unset();
40 |         echo "<script>alert('Logout completed');location.href='./L30-session.php'</script>";
41 |     }
42 | ?>
43 | <!DOCTYPE html>
44 | <html lang="en">
45 | <head>
46 |     <meta charset="UTF-8">
47 |     <meta name="viewport" content="width=device-width, initial-scale=1.0">
48 |     <title>Document</title>
49 | </head>
50 | <body>
51 |     <?php if(!isset($_SESSION['user'])){ ?>
52 |     <table width="750" align="center" cellspacing="0">
53 |         <tr>
54 |             <td>
55 |                 <h2>Login Form</h2>
56 |                 <form action="" method="post">
57 |                     <input type="text" placeholder="User Name" name="userName" required>
58 |                     <br><br>
59 |                     <input type="password" placeholder="password" name="password" required>
60 |                     <br><br>
61 |                     <button type="submit" name="login">Login</button>
62 |                 </form>
63 |             </td>
64 |             <td>
65 |                 <h2>Registration Form</h2>
66 |                 <form action="" method="post">
67 |                     <input type="text" placeholder="User Name" name="ruserName" required>
68 |                     <br><br>
69 |                     <input type="password" placeholder="password" name="rpassword" required>
70 |                     <br><br>
71 |                     <button type="submit" name="register">Register</button>
72 |                 </form>
73 |             </td>
74 |         </tr>
75 |     </table>
76 |     <?php }else{ ?>
77 |         <h2>Welcome <?= $_SESSION['user'] ?></h2>
78 |         <a href="./L30-session.php?logout=yes">Logout</a>
79 |     <?php } ?>
80 | </body>
81 | </html>


--------------------------------------------------------------------------------
/L11-Arrays.php:
--------------------------------------------------------------------------------
  1 | <?php  
  2 |     // index array
  3 |     // $arr = array(1, 2, 3, 4, 5);
  4 |     $arr = ["Bangladesh", 2, true, 4, null, 6.55];
  5 |     echo $arr[0];
  6 |     echo "<pre>";
  7 |     print_r($arr);
  8 |     echo "</pre>";
  9 | 
 10 |     // associative array
 11 |     $arr = ["name" => "Rakib", "age" => 23, "isStudent" => true, "cgpa" => 3.5];
 12 |     echo $arr["name"];
 13 |     echo "<pre>";
 14 |     print_r($arr);
 15 |     echo "</pre>";
 16 | 
 17 |     // multidimensional array
 18 |     $arr = [
 19 |         "student-1" => ["name" => "Rakib", "age" => 23, "isStudent" => true, "cgpa" => 3.5],
 20 |         "student-2" =>["name" => "Sakib", "age" => 24, "isStudent" => true, "cgpa" => 3.4],
 21 |         "student-3" =>["name" => "Mukib", "age" => 43, "isStudent" => true, "cgpa" => 3.3],
 22 |         "student-4" =>["name" => "Nakib", "age" => 53, "isStudent" => true, "cgpa" => 3.2],
 23 |     ];
 24 |     echo $arr["student-1"]["name"];
 25 |     echo "<pre>";
 26 |     print_r($arr);
 27 |     echo "</pre>";
 28 | 
 29 |     $studentNames = [
 30 |         ["Abul", "Babul", "Kabul"],
 31 |         ["Rakib", "Sakib", "Mukib"],
 32 |         ["Nakib", "Dakib", "Bakib"],
 33 |     ]; 
 34 |     echo "<pre>";
 35 |     print_r($studentNames);
 36 |     echo "</pre>";
 37 | 
 38 |     $studentNames = ["Abul", "Babul", "Kabul", "Rakib", "Sakib", "Mukib", "Nakib", "Dakib", "Bakib"];
 39 |     for($i = 0; $i < count($studentNames); $i++){
 40 |         $x;
 41 |         if($i == count($studentNames) - 1){
 42 |             $x = ".";
 43 |         } else if($i == count($studentNames) - 2){
 44 |             $x = " and ";
 45 |         } else {
 46 |             $x = ", ";
 47 |         }
 48 |         echo $studentNames[$i] . $x;
 49 |     }
 50 | 
 51 |     echo "<br>";
 52 | 
 53 |     foreach($studentNames as $i => $name){
 54 |         $x;
 55 |         if($i == count($studentNames) - 1){
 56 |             $x = ".";
 57 |         } else if($i == count($studentNames) - 2){
 58 |             $x = " and ";
 59 |         } else {
 60 |             $x = ", ";
 61 |         }
 62 |         echo $name . $x;
 63 |     }
 64 | 
 65 |     echo "<br>";
 66 | 
 67 |     $studentInfo = [
 68 |         "name" => "Protikkha",
 69 |         "age" => 23,
 70 |         "isStudent" => true,
 71 |         "cgpa" => 3.5,
 72 |         "subjects" => "CSE",
 73 |     ];
 74 | 
 75 |     foreach($studentInfo as $key => $value){
 76 |         echo ucfirst($key) . " : " . $value . "<br>";
 77 |     }
 78 | 
 79 |     echo "<br>";
 80 | 
 81 |     // multidimensional array
 82 |     $students = [
 83 |         ["Rakib", 23, true, 3.5],
 84 |         ["Sakib", 24, true, 3.4],
 85 |         ["Mukib", 43, true, 3.3],
 86 |         ["Nakib", 53, true, 3.2],
 87 |     ];
 88 | 
 89 |     for ($i=0; $i < count($students); $i++) { 
 90 |         for ($j=0; $j < count($students[$i]); $j++) { 
 91 |             echo $students[$i][$j] . " ";
 92 |         }
 93 |         echo "<br>";
 94 |     }
 95 | 
 96 |     echo "<br>";
 97 | 
 98 |     $students = [
 99 |         ["name" => "Rakib", "age" => 23, "isStudent" => true, "cgpa" => 3.5],
100 |         ["name" => "Sakib", "age" => 24, "isStudent" => true, "cgpa" => 3.4],
101 |         ["name" => "Mukib", "age" => 43, "isStudent" => true, "cgpa" => 3.3],
102 |         ["name" => "Nakib", "age" => 53, "isStudent" => true, "cgpa" => 3.2],
103 |     ];
104 | 
105 |     foreach($students as $student){
106 |         foreach($student as $key => $value){
107 |             echo ucfirst($key) . " : " . $value . "<br>";
108 |         }
109 |         echo "<br>";
110 |     }
111 | 
112 | ?>


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/L33-oop-part-3.php:
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  1 | <!--  magic methods -->
  2 |   <?php  
  3 |         class myClass {
  4 |         public $setProperties = [];
  5 |         public $status = "Single";
  6 |         public function __get($name) {
  7 |             echo "You are trying to access non-existing or private property $name <br>";
  8 |         }
  9 | 
 10 |         public function __set($name, $value) {
 11 |             $this->setProperties[$name] = $value;
 12 |             echo $this->setProperties[$name]."<br>";
 13 |         }
 14 | 
 15 |         public function __isset($name) {
 16 |             if(isset($this->setProperties[$name]) || isset($this->$name)) {
 17 |                 echo "Property $name is set <br>";
 18 |             } else {
 19 |                 echo "Property $name is not set <br>";
 20 |             }
 21 |         }
 22 | 
 23 |         public function __unset($name) {
 24 |             echo "Unsetting is not allowed <br>";
 25 |         }
 26 | 
 27 |         // __call() method is triggered when invoking inaccessible methods in an object context.
 28 |         public function __call($name, $arguments) {
 29 |             echo "You are trying to access non-existing or private method $name <br>";
 30 |         }
 31 | 
 32 |         // __callStatic() is triggered when invoking inaccessible methods in a static context.
 33 |         public static function __callStatic($name, $arguments) {
 34 |             echo "You are trying to access non-existing or private static method $name <br>";
 35 |         }
 36 | 
 37 |         // __sleep() method is called when the object is serialized.
 38 |         public function __sleep() {
 39 |             return ["status"];
 40 |         }
 41 |         
 42 |         // __wakeup() method is called when the object is unserialized.
 43 |         public function __wakeup() {
 44 |             echo "Wakeup method is called <br>";
 45 |         }
 46 | 
 47 |         //  __serialize() method is called when the object is serialized.
 48 |         public function __serialize() {
 49 |             return ["setProperties" => $this->status, "status" => $this->status];
 50 |         }
 51 | 
 52 |         // __unserialize() method is called when the object is unserialized.
 53 |         public function __unserialize(array $data) {
 54 |             $this->setProperties = $data["setProperties"];
 55 |             $this->status = $data["status"];
 56 |         }
 57 | 
 58 |         // __toString() method allows a class to decide how it will react when it is treated like a string.
 59 |         public function __toString() {
 60 |             return "This is a myClass object <br>";
 61 |         }
 62 | 
 63 |         // __invoke() method is called when a script tries to call an object as a function.
 64 | 
 65 |         public function __invoke() {
 66 |             return "Object is being called as a function <br>";
 67 |         }
 68 | 
 69 |         // __set_state() is called for classes exported by var_export() when var_export() is called with the __set_state() magic method.
 70 |         public static function __set_state(array $properties) {
 71 |             $obj = new myClass();
 72 |             $obj->setProperties = $properties["setProperties"];
 73 |             $obj->status = $properties["status"];
 74 |             return $obj;
 75 |         }
 76 | 
 77 |         // __clone() method is called when an object is cloned.
 78 |         public function __clone() {
 79 |             echo "Object is being cloned <br>";
 80 |         }
 81 | 
 82 |         // __debugInfo() method is called by var_dump() when dumping an object to get the properties that should be shown.
 83 |         public function __debugInfo() {
 84 |             return ["setProperties" => $this->setProperties, "status" => $this->status];
 85 |         }
 86 |     } 
 87 | 
 88 |     $obj = new myClass();
 89 |     echo $obj->city;
 90 |     $obj->city = "Dhaka";
 91 |     isset($obj->age);
 92 |     unset($obj->city);
 93 |     $obj->myMethod();
 94 |     myClass::myStaticMethod();
 95 |     echo "<pre>";
 96 |     print_r(serialize($obj));
 97 |     echo "</pre>";
 98 |     echo unserialize(serialize($obj))->status;
 99 |     echo "<br>";
100 |     echo $obj;
101 |     echo $obj();
102 |     $obj->setProperties = ["name" => "Aiman", "age" => 22];
103 | 
104 |     $exportedObj = var_export($obj, true);
105 |     eval('$newObj = '.$exportedObj.';');
106 |     echo "<pre>";
107 |     print_r($newObj);
108 |     echo "</pre>";
109 | 
110 |     $clonedObj = clone $obj;
111 |     echo "<pre>";
112 |     print_r($obj);
113 |     echo "</pre>";
114 |   ?>


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/hw/protikha6-06-2024/homework.php:
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  1 | <?php
  2 | 
  3 | // i. Find maximum number from an array
  4 | function findMax($array) {
  5 |     return max($array);
  6 | }
  7 | 
  8 | // ii. Find 2nd max number from an array
  9 | function findSecondMax($array) {
 10 |     rsort($array);
 11 |     return $array[1];
 12 | }
 13 | 
 14 | // iii. Sort array from min to max
 15 | function sortArray($array) {
 16 |     sort($array);
 17 |     return $array;
 18 | }
 19 | 
 20 | // iv. Calculate average number of an array
 21 | function calculateAverage($array) {
 22 |     return array_sum($array) / count($array);
 23 | }
 24 | 
 25 | // v. Merging 2 different types of array together
 26 | function mergeArrays($array1, $array2) {
 27 |     return array_merge($array1, $array2);
 28 | }
 29 | 
 30 | // vi. Search data from an array
 31 | function searchData($array, $value) {
 32 |     return in_array($value, $array);
 33 | }
 34 | 
 35 | // vii. Show array data in lowercase and uppercase
 36 | function showArrayCase($array) {
 37 |     return [
 38 |         'lowercase' => array_map('strtolower', $array),
 39 |         'uppercase' => array_map('strtoupper', $array),
 40 |     ];
 41 | }
 42 | 
 43 | // viii. Get unique values
 44 | function getUniqueValues($array) {
 45 |     return array_unique($array);
 46 | }
 47 | 
 48 | // ix. Remove duplicate values
 49 | function removeDuplicates($array) {
 50 |     return array_values(array_unique($array));
 51 | }
 52 | 
 53 | // x. Check if email address is unique
 54 | function isEmailUnique($array, $email) {
 55 |     return !in_array($email, $array);
 56 | }
 57 | 
 58 | // xi. Check unique username
 59 | function isUsernameUnique($array, $username) {
 60 |     return !in_array($username, $array);
 61 | }
 62 | 
 63 | // xii. Merge 2 comma separated lists with unique value only
 64 | function mergeCommaSeparatedLists($list1, $list2) {
 65 |     $array1 = explode(',', $list1);
 66 |     $array2 = explode(',', $list2);
 67 |     return implode(',', array_unique(array_merge($array1, $array2)));
 68 | }
 69 | 
 70 | // xiii. Difference between 2 multi-dimensional arrays
 71 | function arrayDiffMulti($array1, $array2) {
 72 |     return array_diff_assoc($array1, $array2);
 73 | }
 74 | 
 75 | // xiv. Check if all values are string or not
 76 | function areAllValuesString($array) {
 77 |     foreach ($array as $value) {
 78 |         if (!is_string($value)) {
 79 |             return false;
 80 |         }
 81 |     }
 82 |     return true;
 83 | }
 84 | 
 85 | // xv. Union of 2 arrays
 86 | function unionArrays($array1, $array2) {
 87 |     return array_unique(array_merge($array1, $array2));
 88 | }
 89 | 
 90 | // xvi. Filter out array data with some specific keys
 91 | function filterArrayByKeys($array, $keys) {
 92 |     return array_intersect_key($array, array_flip($keys));
 93 | }
 94 | 
 95 | // xvii. Filter a multi-dimensional array
 96 | function filterMultiDimensionalArray($array, $callback) {
 97 |     return array_filter($array, $callback);
 98 | }
 99 | 
100 | // xviii. Remove all white spaces from an array
101 | function removeWhiteSpaces($array) {
102 |     return array_map('trim', $array);
103 | }
104 | 
105 | // xix. Combine 2 arrays and use one array data as keys and others as values
106 | function combineArraysAsKeyValue($keys, $values) {
107 |     return array_combine($keys, $values);
108 | }
109 | 
110 | // xx. Convert string to array
111 | function stringToArray($string, $delimiter = ',') {
112 |     return explode($delimiter, $string);
113 | }
114 | 
115 | // Example usage:
116 | 
117 | // i.
118 | echo "<pre>";
119 | echo findMax([1, 2, 3, 4, 5]); // 5
120 | 
121 | // ii.
122 | echo findSecondMax([1, 2, 3, 4, 5]); // 4
123 | 
124 | // iii.
125 | print_r(sortArray([5, 3, 1, 4, 2]));
126 | 
127 | // iv.
128 | echo calculateAverage([1, 2, 3, 4, 5]); // 3
129 | 
130 | // v.
131 | print_r(mergeArrays([1, 2], ['a', 'b']));
132 | 
133 | // vi.
134 | echo searchData([1, 2, 3, 4, 5], 3); // 1 (true)
135 | 
136 | // vii.
137 | print_r(showArrayCase(['Apple', 'Banana', 'Cherry']));
138 | 
139 | // viii.
140 | print_r(getUniqueValues([1, 1, 2, 2, 3, 3]));
141 | 
142 | // ix.
143 | print_r(removeDuplicates([1, 1, 2, 2, 3, 3]));
144 | 
145 | // x.
146 | echo isEmailUnique(['test@example.com'], 'new@example.com'); // 1 (true)
147 | 
148 | // xi.
149 | echo isUsernameUnique(['user1', 'user2'], 'user3'); // 1 (true)
150 | 
151 | // xii.
152 | echo mergeCommaSeparatedLists('a,b,c', 'b,c,d'); // a,b,c,d
153 | 
154 | // xiii.
155 | print_r(arrayDiffMulti(['a' => 1, 'b' => 2], ['a' => 1, 'b' => 3]));
156 | 
157 | // xiv.
158 | echo areAllValuesString(['a', 'b', 'c']); // 1 (true)
159 | 
160 | // xv.
161 | print_r(unionArrays([1, 2], [2, 3]));
162 | 
163 | // xvi.
164 | print_r(filterArrayByKeys(['a' => 1, 'b' => 2, 'c' => 3], ['a', 'c']));
165 | 
166 | // xvii.
167 | print_r(filterMultiDimensionalArray([['name' => 'John'], ['name' => 'Jane']], function($item) {
168 |     return $item['name'] === 'John';
169 | }));
170 | 
171 | // xviii.
172 | print_r(removeWhiteSpaces([' a ', ' b ', ' c ']));
173 | 
174 | // xix.
175 | print_r(combineArraysAsKeyValue(['a', 'b'], [1, 2]));
176 | 
177 | // xx.
178 | print_r(stringToArray('a,b,c'));
179 | echo "</pre>";
180 | ?>
181 | 


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/L17-problem-solving.php:
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  1 | <?php  
  2 |     //  Find maximum number from an array
  3 |     $arr = [5, 81, 34, 96, 15, 62, 74, 23, 42];
  4 | 
  5 |     $max = $arr[0];
  6 |     for($i = 1; $i < count($arr); $i++){
  7 |         if($arr[$i] > $max){
  8 |             $max = $arr[$i];
  9 |         }
 10 |     }
 11 |     echo "Maximum number is: ".$max."<br>";
 12 | 
 13 |     echo max($arr)."<br>";
 14 | 
 15 |     // Find 2nd max number from an array
 16 |     $arr = [5, 81, 34, 96, 15, 62, 74, 23, 42];
 17 |     $max = $arr[0];
 18 |     $secondMax = $arr[0];
 19 |     for($i = 1; $i < count($arr); $i++){
 20 |         if($arr[$i] > $max){
 21 |             $secondMax = $max;
 22 |             $max = $arr[$i];
 23 |         }else if($arr[$i] > $secondMax && $arr[$i] < $max){
 24 |             $secondMax = $arr[$i];
 25 |         }
 26 |     }
 27 | 
 28 |     echo "Second Maximum number is: ".$secondMax."<br>";
 29 | 
 30 |     // Sort array from min to max
 31 |     $arr = [5, 81, 34, 96, 15, 62, 74, 23, 42];
 32 |     sort($arr);
 33 |     echo "<pre>";
 34 |     print_r($arr);
 35 |     echo "</pre>";
 36 | 
 37 |     // Calculate average number of an array
 38 |     $arr = [5, 81, 34, 96, 15, 62, 74, 23, 42];
 39 |     $sum = 0;
 40 |     for($i = 0; $i < count($arr); $i++){
 41 |         $sum += $arr[$i];
 42 |     }
 43 |     $average = $sum / count($arr);
 44 |     echo "Average number is: ".$average."<br>";
 45 | 
 46 |     //  Merging 2 different types of array together
 47 |     $arr1 = [5, 81, 34, 96, 15, 62, 74, 23, 42];
 48 |     $arr2 = ["Dhaka", "Barishal", "Bogura", "Noyakhali", "Chatogram", "Bogura"];
 49 |     $merged_arr = array_merge($arr1, $arr2);
 50 |     echo "<pre>";
 51 |     print_r($merged_arr);
 52 |     echo "</pre>";
 53 | 
 54 |     // Search data from an array
 55 |     $arr = ["Dhaka", "Barishal", "Bogura", "Noyakhali", "Chatogram", "Bogura"];
 56 |     $search = "Bogura";
 57 |     $found = false;
 58 |     for($i = 0; $i < count($arr); $i++){
 59 |         if($arr[$i] == $search){
 60 |             $found = true;
 61 |             break;
 62 |         }
 63 |     }
 64 |     if($found){
 65 |         echo "Data found";
 66 |     }else{
 67 |         echo "Data not found";
 68 |     }
 69 | 
 70 |     echo "<br>";
 71 | 
 72 |     // Show array data in lowercase and uppercase
 73 |     $arr = ["Dhaka", "Barishal", "Bogura", "Noyakhali", "Chatogram", "Bogura"];
 74 |     for($i = 0; $i < count($arr); $i++){
 75 |         echo strtoupper($arr[$i])."<br>";
 76 |     }
 77 | 
 78 |     echo "<br>";
 79 | 
 80 |     for($i = 0; $i < count($arr); $i++){
 81 |         echo strtolower($arr[$i])."<br>";
 82 |     }
 83 | 
 84 |     // Get unique values
 85 |     $arr = ["Dhaka", "Barishal", "Bogura", "Noyakhali", "Chattogram", "Bogura", "Dhaka", "Barishal"];
 86 |     $unique = [];
 87 |     for($i = 0; $i < count($arr); $i++){
 88 |         if(!in_array($arr[$i], $unique)){
 89 |             array_push($unique, $arr[$i]);
 90 |         }
 91 |     }
 92 | 
 93 |     echo "<pre>";
 94 |     print_r($unique);
 95 |     echo "</pre>";
 96 |     
 97 |     // Check if email address is unique
 98 |     $emails = ["abdul@gmail.com", "kuddus@gmail.com", "kurban@gmail.com", "bablu@gmail.com"];
 99 |     $email = "kuddus@gmail.com";
100 | 
101 |     if(in_array($email, $emails)){
102 |         echo "Email already exists";
103 |     }else{
104 |         echo "Email is unique";
105 |     }
106 | 
107 |     // Merge 2 comma separated lists with unique value only
108 |     $list1 = "Dhaka, Bogura, Noyakhali, Chattogram, Bogura, Dhaka, Barishal, Jhinaidah";
109 |     $list2 = "Dhaka, Barishal, Bogura, Noyakhali, Chattogram, Bogura, Dhaka, Barishal, Kustia";
110 |     $arr1 = explode(", ", $list1);
111 |     $arr2 = explode(", ", $list2);
112 |     $merged_arr = array_merge($arr1, $arr2);
113 |     $unique = [];
114 |     for($i = 0; $i < count($merged_arr); $i++){
115 |         if(!in_array($merged_arr[$i], $unique)){
116 |             array_push($unique, $merged_arr[$i]);
117 |         }
118 |     }
119 | 
120 |     echo "<pre>";
121 |     print_r($unique);
122 |     echo "</pre>";
123 | 
124 |     $text = "Ami vaat Khai";
125 |     $arr = explode(" ", $text);
126 |     echo "<pre>";
127 |     print_r($arr);
128 |     echo "</pre>";
129 | 
130 |     // Difference between 2 multi-dimensional arrays
131 |     $arr1 = [
132 |         ["name" => "Rakib", "age" => 23, "isStudent" => true, "cgpa" => 3.5],
133 |         ["name" => "Sakib", "age" => 24, "isStudent" => true, "cgpa" => 3.6],
134 |         ["name" => "Mukib", "age" => 25, "isStudent" => true, "cgpa" => 3.7],
135 |     ];
136 | 
137 |     $arr2 = [
138 |         ["name" => "Rakib", "age" => 23, "isStudent" => true, "cgpa" => 3.5],
139 |         ["name" => "Sakib", "age" => 24, "isStudent" => true, "cgpa" => 3.6],
140 |         ["name" => "Mukib", "age" => 25, "isStudent" => true, "cgpa" => 3.7],
141 |         ["name" => "Nakib", "age" => 26, "isStudent" => true, "cgpa" => 3.8],
142 |     ];
143 | 
144 |     $diff = [];
145 |     for($i = 0; $i < count($arr2); $i++){
146 |         if(!in_array($arr2[$i], $arr1)){
147 |             array_push($diff, $arr2[$i]);
148 |         }
149 |     }
150 | 
151 |     echo "<pre>";
152 |     print_r($diff);
153 |     echo "</pre>";
154 | 
155 |     // Check if all values are string or not
156 |     $arr = ["Dhaka", "Barishal", "Bogura", "Noyakhali", "Chattogram", "Bogura"];
157 |     $allString = true;
158 |     for($i = 0; $i < count($arr); $i++){
159 |         if(!is_string($arr[$i])){
160 |             $allString = false;
161 |             break;
162 |         }
163 |     }
164 | 
165 |     if($allString){
166 |         echo "All values are string";
167 |     }else{
168 |         echo "All values are not string";
169 |     }
170 | 
171 |     echo "<br>";
172 | 
173 |     // Filter out array data with some specific keys
174 |     $arr = [
175 |         ["name" => "Rakib", "age" => 23, "isStudent" => true, "cgpa" => 3.5],
176 |         ["name" => "Sakib", "age" => 24, "isStudent" => true, "cgpa" => 3.6],
177 |         ["name" => "Mukib", "age" => 25, "isStudent" => true, "cgpa" => 3.7],
178 |     ];
179 | 
180 |     $filtered = [];
181 |     for($i = 0; $i < count($arr); $i++){
182 |         $filtered[$i]["name"] = $arr[$i]["name"];
183 |         $filtered[$i]["age"] = $arr[$i]["age"];
184 |     }
185 |     echo "<pre>";
186 |     print_r($filtered);
187 |     echo "</pre>";
188 | 
189 |     // Combine 2 array and use one array data as keys and others as values
190 |     $arr1 = ["name", "age", "isStudent", "cgpa"];
191 |     $arr2 = ["Rakib", 23, true, 3.5];
192 |     $combined = [];
193 |     for($i = 0; $i < count($arr1); $i++){
194 |         $combined[$arr1[$i]] = $arr2[$i];
195 |     }
196 |     $combined["city"] = "Dhaka";
197 |     echo "<pre>";
198 |     print_r($combined);
199 |     echo "</pre>";
200 | 
201 | ?>


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/L19-form-validation.php:
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  1 | <?php
  2 | function validate($data)
  3 | {
  4 |     $data = trim($data);
  5 |     $data = htmlspecialchars($data);
  6 |     $data = stripslashes($data);
  7 |     return $data;
  8 | }
  9 | 
 10 | function checkHobbies($datas)
 11 | {
 12 |     // validate
 13 |     $datas = array_map('validate', $datas);
 14 |     // check
 15 |     return $datas;
 16 | }
 17 | 
 18 | $genderList = ["Male", "Female"];
 19 | $hobbiesList = ["Reading", "Writing", "Coding"];
 20 | $allCountries = ["Afghanistan","Albania","Algeria","Andorra","Angola","Anguilla","Antigua &amp; Barbuda","Argentina","Armenia","Aruba","Australia","Austria","Azerbaijan","Bahamas","Bahrain","Bangladesh","Barbados","Belarus","Belgium","Belize","Benin","Bermuda","Bhutan","Bolivia","Bosnia &amp; Herzegovina","Botswana","Brazil","British Virgin Islands","Brunei","Bulgaria","Burkina Faso","Burundi","Cambodia","Cameroon","Cape Verde","Cayman Islands","Chad","Chile","China","Colombia","Congo","Cook Islands","Costa Rica","Cote D Ivoire","Croatia","Cruise Ship","Cuba","Cyprus","Czech Republic","Denmark","Djibouti","Dominica","Dominican Republic","Ecuador","Egypt","El Salvador","Equatorial Guinea","Estonia","Ethiopia","Falkland Islands","Faroe Islands","Fiji","Finland","France","French Polynesia","French West Indies","Gabon","Gambia","Georgia","Germany","Ghana","Gibraltar","Greece","Greenland","Grenada","Guam","Guatemala","Guernsey","Guinea","Guinea Bissau","Guyana","Haiti","Honduras","Hong Kong","Hungary","Iceland","India","Indonesia","Iran","Iraq","Ireland","Isle of Man","Israel","Italy","Jamaica","Japan","Jersey","Jordan","Kazakhstan","Kenya","Kuwait","Kyrgyz Republic","Laos","Latvia","Lebanon","Lesotho","Liberia","Libya","Liechtenstein","Lithuania","Luxembourg","Macau","Macedonia","Madagascar","Malawi","Malaysia","Maldives","Mali","Malta","Mauritania","Mauritius","Mexico","Moldova","Monaco","Mongolia","Montenegro","Montserrat","Morocco","Mozambique","Namibia","Nepal","Netherlands","Netherlands Antilles","New Caledonia","New Zealand","Nicaragua","Niger","Nigeria","Norway","Oman","Pakistan","Palestine","Panama","Papua New Guinea","Paraguay","Peru","Philippines","Poland","Portugal","Puerto Rico","Qatar","Reunion","Romania","Russia","Rwanda","Saint Pierre &amp; Miquelon","Samoa","San Marino","Satellite","Saudi Arabia","Senegal","Serbia","Seychelles","Sierra Leone","Singapore","Slovakia","Slovenia","South Africa","South Korea","Spain","Sri Lanka","St Kitts &amp; Nevis","St Lucia","St Vincent","St. Lucia","Sudan","Suriname","Swaziland","Sweden","Switzerland","Syria","Taiwan","Tajikistan","Tanzania","Thailand","Timor L'Este","Togo","Tonga","Trinidad &amp; Tobago","Tunisia","Turkey","Turkmenistan","Turks &amp; Caicos","Uganda","Ukraine","United Arab Emirates","United Kingdom","Uruguay","Uzbekistan","Venezuela","Vietnam","Virgin Islands (US)","Yemen","Zambia","Zimbabwe"];
 21 | 
 22 | if (isset($_POST['reg123']) && $_POST['reg123'] == 'Sign-up') {
 23 |     $name = validate($_POST['name']);
 24 |     $email = validate($_POST['email']);
 25 |     $age = validate($_POST['age']);
 26 |     $gender = isset($_POST['gender']) ? validate($_POST['gender']) : null;
 27 |     $hobbies = isset($_POST['hobbies']) ? checkHobbies($_POST['hobbies']) : null;
 28 |     $country = validate($_POST['country']);
 29 | 
 30 |     if (empty($name)) {
 31 |         $errName = "Name is required";
 32 |     } elseif (!preg_match('/^[A-Za-z. ]*$/', $name)) {
 33 |         $errName = "Only letters and white space allowed";
 34 |     } else {
 35 |         $correctName = $name;
 36 |     }
 37 | 
 38 |     if (empty($email)) {
 39 |         $errEmail = "Email is required";
 40 |     } elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
 41 |         $errEmail = "Invalid email format";
 42 |     } else {
 43 |         $correctEmail = $email;
 44 |     }
 45 | 
 46 |     if (empty($age)) {
 47 |         $errAge = "Age is required";
 48 |     } elseif (!filter_var($age, FILTER_VALIDATE_INT)) {
 49 |         $errAge = "Invalid age format";
 50 |     } else {
 51 |         $correctAge = $age;
 52 |     }
 53 | 
 54 |     if (empty($gender)) {
 55 |         $errGender = "Please select your gender";
 56 |     } elseif (!in_array($gender, $genderList)) {
 57 |         $errGender = "Har baap ka e baap hota hey!";
 58 |     } else {
 59 |         $correctGender = $gender;
 60 |     }
 61 | 
 62 |     if (empty($hobbies)) {
 63 |         $errHobbies = "Please select your hobbies";
 64 |     }else{
 65 |         foreach($hobbies as $hobby){
 66 |             if(!in_array($hobby, $hobbiesList)){
 67 |                 $errHobbies = "Har baap ka e baap hota hey!";
 68 |                 break;
 69 |             }
 70 |         }
 71 |         if(!isset($errHobbies)){
 72 |             $correctHobbies = $hobbies;
 73 |         }
 74 |     }
 75 |     if(empty($country)){
 76 |         $errCountry = "Please select your country";
 77 |     }elseif(!in_array($country, $allCountries)){
 78 |         $errCountry = "Har baap ka e baap hota hey!";
 79 |     }else{
 80 |         $correctCountry = $country;
 81 |     }
 82 | }
 83 | ?>
 84 | <!DOCTYPE html>
 85 | <html lang="en">
 86 | 
 87 | <head>
 88 |     <meta charset="UTF-8">
 89 |     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 90 |     <title>Document</title>
 91 |     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
 92 | </head>
 93 | 
 94 | <body>
 95 |     <div class="container">
 96 |         <div class="row min-vh-100">
 97 |             <div class="col-md-5 m-auto border rounded shadow p-4">
 98 |                 <h2 class="mb-3">Sign-up form</h2>
 99 |                 <form action="<?= $_SERVER['PHP_SELF'] ?>" method="post">
100 |                     <div class="mb-3">
101 |                         <input type="text" placeholder="Your Name" name="name" class="form-control <?= isset($errName) ? 'is-invalid' : null ?>" value="<?= $correctName ?? null ?>">
102 |                         <div class="invalid-feedback"><?= $errName ?? null ?></div>
103 |                     </div>
104 |                     <div class="mb-3">
105 |                         <input type="text" placeholder="Your Email" name="email" class="form-control <?= isset($errEmail) ? 'is-invalid' : null ?>" value="<?= $correctEmail ?? null ?>">
106 |                         <div class="invalid-feedback"><?= $errEmail ?? null ?></div>
107 |                     </div>
108 |                     <div class="mb-3">
109 |                         <input type="text" placeholder="Your Age" name="age" class="form-control <?= isset($errAge) ? 'is-invalid' : null ?>" value="<?= $correctAge ?? null ?>">
110 |                         <div class="invalid-feedback"><?= $errAge ?? null ?></div>
111 |                     </div>
112 |                     <div class="<?= isset($errGender) ? "border border-danger" : null ?> rounded py-1">
113 |                         <div class="form-check form-check-inline">
114 |                             <label for="">Gender :</label>
115 |                         </div>
116 |                         <div class="form-check form-check-inline">
117 |                             <label for="male">
118 |                                 <input type="radio" class="form-check-input" name="gender" value="Male" id="male" <?= isset($correctGender) && $correctGender === "Male" ? "checked" : null ?> />Male
119 |                             </label>
120 |                         </div>
121 |                         <div class="form-check form-check-inline">
122 |                             <label for="female">
123 |                                 <input type="radio" class="form-check-input" name="gender" value="Female" id="female" <?= isset($correctGender) && $correctGender === "Female" ? "checked" : null ?> />Female
124 |                             </label>
125 |                         </div>
126 |                     </div>
127 |                     <div class="mb-3 text-danger small">
128 |                         <?= $errGender ?? null ?>
129 |                     </div>
130 |                     <div class="<?= isset($errHobbies) ? "border border-danger" : null ?> rounded py-1">
131 |                         <div class="form-check form-check-inline">
132 |                             <label for="">Hobbies :</label>
133 |                         </div>
134 |                         <div class="form-check form-check-inline">
135 |                             <label for="reading">
136 |                                 <input type="checkbox" class="form-check-input" name="hobbies[]" value="Reading" id="reading" <?= isset($hobbies) && in_array("Reading", $hobbies) ? "checked":null ?> />Reading
137 |                             </label>
138 |                         </div>
139 |                         <div class="form-check form-check-inline">
140 |                             <label for="writing">
141 |                                 <input type="checkbox" class="form-check-input" name="hobbies[]" value="Writing" id="writing" <?= isset($hobbies) && in_array("Writing", $hobbies) ? "checked":null ?> />Writing
142 |                             </label>
143 |                         </div>
144 |                         <div class="form-check form-check-inline">
145 |                             <label for="coding">
146 |                                 <input type="checkbox" class="form-check-input" name="hobbies[]" value="Coding" id="coding" <?= isset($hobbies) && in_array("Coding", $hobbies) ? "checked":null ?> />Coding
147 |                             </label>
148 |                         </div>
149 |                     </div>
150 |                     <div class="mb-3 text-danger small">
151 |                         <?= $errHobbies ?? null ?>
152 |                     </div>
153 |                     <div class="mb-3">
154 |                         <select name="country" class="form-select <?= isset($errCountry) ? "is-invalid":null ?>">
155 |                             <option value="">Select Country</option>
156 |                             <?php foreach ($allCountries as $cy){ ?>
157 |                             <option value="<?= $cy ?>" <?= isset($country) && $country == $cy ? "selected":null ?>><?= $cy ?></option>
158 |                             <?php } ?>
159 |                         </select>
160 |                         <div class="invalid-feedback">
161 |                             <?= $errCountry ?? null ?>
162 |                         </div>
163 |                     </div>
164 |                     <div class="mb-3">
165 |                         <input type="submit" name="reg123" value="Sign-up" class="btn btn-primary">
166 |                     </div>
167 |                 </form>
168 |             </div>
169 |         </div>
170 |     </div>
171 | </body>
172 | 
173 | </html>


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