├── interface.php
├── static.php
├── abstract.php
├── encapsulation.php
├── inheritance.php
├── polymorphism.php
├── OOP.txt
└── README.md


/interface.php:
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 1 | <?php
 2 | 
 3 | interface School{
 4 | 	public function mySchool();
 5 | }
 6 | 
 7 | class Teacher implements School{
 8 | 	
 9 | 	public function __construct(){
10 | 		$this->mySchool();
11 | 	}
12 | 	
13 | 	public function mySchool(){
14 | 		echo "I'm a school teacher";
15 | 	}
16 | } 
17 | 
18 | $teacher = new Teacher();


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/static.php:
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 1 | <?php
 2 | class UserData{
 3 | 	
 4 | 	public $userId;
 5 | 	public $userName;
 6 | 	public static $age = "30";
 7 | 	
 8 | 	public function __construct($id, $name){
 9 | 		$this->userId = $id;
10 | 		$this->userName = $name;
11 | 	}
12 | 	
13 | 	public function display(){
14 | 		echo "User Id is <b>" . $this->userId . "</b> and User name is <b>" . $this->userName . "</b> and Age is " . self::$age;
15 | 	}
16 | 	
17 | 	public static function profile(){
18 | 		echo self::$age;
19 | 	}
20 | }
21 | 
22 | $user = new UserData("101", "Shahid Nawaz");
23 | // $user->display();
24 | 
25 | UserData::profile();
26 | 


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/abstract.php:
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 1 | <?php
 2 | 
 3 | abstract class Student{
 4 | 	public $name;
 5 | 	public $age;
 6 | 	
 7 | 	public function details(){
 8 | 		echo $this->name . " is " . $this->age . " years old.";
 9 | 	}
10 | 	
11 | 	abstract public function school();
12 | }
13 | 
14 | class Boy extends Student{
15 | 	
16 | 	public function describe(){
17 | 		return parent::details() . " and I am a high school student. <br>";
18 | 	}
19 | 	
20 | 	public function school(){
21 | 		return "<br>I like to read story book";
22 | 	}
23 | } 
24 | 
25 | $boy = new Boy();
26 | $boy->name = "Shahid Nawaz";
27 | $boy->age = 26;
28 | $boy->describe();
29 | echo $boy->school();


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/encapsulation.php:
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 1 | <?php
 2 | 
 3 | class User{
 4 | 	
 5 | 	public $name;
 6 | 	public $age;
 7 | 	private $salary;
 8 | 	
 9 | 	public function __construct($user_name, $user_age){
10 | 		$this->name = $user_name;
11 | 		$this->age = $user_age;
12 | 	}
13 | 	
14 | 	public function setSalary($amount){
15 | 		$this->salary = $amount;
16 | 	}
17 | 	
18 | 	public function getSalary(){
19 | 		if($this->salary > 0){
20 | 			echo "Name: " . $this->name . "<br> Age: " . $this->age . "<br> Salary: " . $this->salary;
21 | 		} else {
22 | 			echo "Insufficient Balance!";
23 | 		}
24 | 	}
25 | }
26 | 
27 | $user = new User("Shahid Nawaz", 26);
28 | $user->setSalary(1500);
29 | $user->getSalary();


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/inheritance.php:
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 1 | <?php
 2 | class UserData{
 3 | 	
 4 | 	public $userId;
 5 | 	public $userName;
 6 | 	
 7 | 	public function __construct($id, $name){
 8 | 		$this->userId = $id;
 9 | 		$this->userName = $name;
10 | 	}
11 | 	
12 | 	public function display(){
13 | 		echo "User Id is <b>" . $this->userId . "</b> and User name is <b>" . $this->userName . "</b>";
14 | 	}
15 | }
16 | 
17 | class Admin extends UserData{
18 | 	
19 | 	public $label;
20 | 	
21 | 	public function display(){
22 | 		echo "User Id is <b>" . $this->userId . "</b> and User name is <b>" . $this->userName . "</b> and label is <b>" . $this->label . "</b>";
23 | 	}
24 | }
25 | 
26 | $user = new Admin("101", "Shahid Nawaz");
27 | $user->label = 'Administrator';
28 | $user->display();
29 | 
30 | 


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/polymorphism.php:
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 1 | <?php
 2 | class UserData{
 3 | 	
 4 | 	public $userId;
 5 | 	public $userName;
 6 | 	
 7 | 	public function __construct($id, $name){
 8 | 		$this->userId = $id;
 9 | 		$this->userName = $name;
10 | 	}
11 | 	
12 | 	public function display(){
13 | 		echo "User Id is <b>" . $this->userId . "</b> and User name is <b>" . $this->userName . "</b>";
14 | 	}
15 | }
16 | 
17 | class Admin extends UserData{
18 | 	
19 | 	public $label;
20 | 	
21 | 	public function display(){
22 | 		echo "User Id is <b>" . $this->userId . "</b> and User name is <b>" . $this->userName . "</b> and label is <b>" . $this->label . "</b>";
23 | 	}
24 | }
25 | 
26 | $user = new Admin("101", "Shahid Nawaz");
27 | $user->label = 'Administrator';
28 | $user->display();
29 | 
30 | 


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/OOP.txt:
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 1 | ## Static
 2 | 	=> Static method can be called without creating object (ex. ClassName::methodName())
 3 | 	=> Static property can be used in same class (ex. self::$property)
 4 | 
 5 | ## Modifiers
 6 | 	1. Public (Can be access in same class or out of class)
 7 | 	2. Private (Can be access only in same class)
 8 | 	3. Protected (Can be used in same class and inheritance or interface class)
 9 | 
10 | ## Inheritance
11 | 	=> Parent child concept
12 | 	=> Child class can be used parent class public and Protected data
13 | 	=> Child class can't access parent class private data
14 | 	
15 | ## Polymorphism
16 | 	=> Polymorphism means the ability to have many forms
17 | 	=> Same name two methods can works different purpose
18 | 	=> There are two types of Polymorphism: 
19 | 			1. Compile time (function overloading)
20 | 			2. Run time (function overriding)
21 | 	
22 | ## Encapsulation
23 | 	=> Hide data from user
24 | 	=> GETTER and SETTER methods concept
25 | 	=> Can be get data using method
26 | 	=> Can be validate data in method
27 | 	
28 | ## Abstraction
29 | 	=> Can't make Object
30 | 	=> Can be used by 'extends'
31 | 	=> Can be create method definition with or without method body
32 | 	=> If we create abstract method, class must be abstract
33 | 	
34 | ## Interface
35 | 	=> Can't make object
36 | 	=> Can be used by 'implements'
37 | 	=> Can be implements multiple interface class in same time
38 | 	=> Only create method defination, no method body allowed
39 | 	


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/README.md:
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 1 | # Object Oriented Programming Example
 2 | 
 3 | ## Static
 4 | 	=> Static method can be called without creating object (ex. ClassName::methodName())
 5 | 	=> Static property can be used in same class (ex. self::$property)
 6 | 
 7 | ## Modifiers
 8 | 	1. Public (Can be access in same class or out of class)
 9 | 	2. Private (Can be access only in same class)
10 | 	3. Protected (Can be used in same class and inheritance or interface class)
11 | 
12 | ## Inheritance
13 | 	=> Parent child concept
14 | 	=> Child class can be used parent class public and Protected data
15 | 	=> Child class can't access parent class private data
16 | 	
17 | ## Polymorphism
18 | 	=> Polymorphism means the ability to have many forms
19 | 	=> Same name two methods can works different purpose
20 | 	=> There are two types of Polymorphism: 
21 | 			1. Compile time (function overloading)
22 | 			2. Run time (function overriding)
23 | 	
24 | ## Encapsulation
25 | 	=> Hide data from user
26 | 	=> GETTER and SETTER methods concept
27 | 	=> Can be get data using method
28 | 	=> Can be validate data in method
29 | 	
30 | ## Abstraction
31 | 	=> Can't make Object
32 | 	=> Can be used by 'extends'
33 | 	=> Can be create method definition with or without method body
34 | 	=> If we create abstract method, class must be abstract
35 | 	
36 | ## Interface
37 | 	=> Can't make object
38 | 	=> Can be used by 'implements'
39 | 	=> Can be implements multiple interface class in same time
40 | 	=> Only create method defination, no method body allowed
41 | 	
42 | 


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