├── LICENSE ├── README.md ├── array.php ├── array_diff.php ├── array_filter.php ├── array_flip.php ├── array_key_exists.php ├── array_keys.php ├── array_map.php ├── array_merge.php ├── array_pop.php ├── array_push.php ├── array_reverse.php ├── array_shift.php ├── array_slice.php ├── array_unique.php ├── array_unshift.php ├── array_values.php ├── asort.php ├── call_user_func.php ├── call_user_func_array.php ├── current.php ├── dirname.php ├── end.php ├── explode.php ├── file.txt ├── file_exists.php ├── file_get_contents.php ├── filesize.php ├── function.php ├── function_exists.php ├── fwrite.php ├── getcwd.php ├── gettype.php ├── headers_sent.php ├── htmlspecialchars.php ├── implode.php ├── in_array.php ├── ini_get.php ├── is_bool.php ├── is_dir.php ├── is_int.php ├── is_null.php ├── is_numeric.php ├── is_object.php ├── is_readable.php ├── is_resource.php ├── is_writeable.php ├── key.php ├── krsort.php ├── ksort.php ├── max.php ├── microtime.php ├── min.php ├── mkdir.php ├── next.php ├── parse_url.php ├── phpinfo.php ├── prev.php ├── realpath.php ├── rsort.php ├── sort.php ├── sprintf.php ├── str_repeat.php ├── str_replace.php ├── stripslashes.php ├── strpos.php ├── strrpos.php ├── strtolower.php ├── strtr.php ├── substr.php ├── time.php ├── trim.php ├── ucfirst.php ├── unlink.php └── version_compare.php /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Top PHP Functions 2 | 3 | If you are a PHP developer, you must know the Top 100 PHP Functions deeply. 4 | 5 | ## The 100 PHP functions that you have to know (2022) 6 | 7 | Here is the top 100 PHP functions: it is the list of the most often used PHP native functions. 8 | 9 | > Why this repository? As a lead developer in the team, I am teaching the functions to my team members deeply. 10 | 11 | ## Where is the Data? 12 | 13 | The functions are named, and ranked from 1 to 100. The other 4500 functions are not ranked here. 14 | 15 | The frequency column represents how often this function is used across PHP code repositories: the reference corpus is a list of 2500 PHP Open Source projects (top 1000 composer, github/gitlab/gitee public repo, downloaded archives…). 16 | 17 | ### PHP Functions 18 | 19 | | Rank | Function | Frequency | Average | 20 | | ------ | --------- | ------------- | ------- | 21 | | 1 | file_exists | 62.80% | 13 | 22 | | 2 | str_replace | 58.20% | 33 | 23 | | 3 | implode | 57.31% | 35 | 24 | | 4 | count | 56.42% | 61 | 25 | | 5 | dirname | 56.38% | 13 | 26 | | 6 | substr | 55.84% | 53 | 27 | | 7 | sprintf | 55.26% | 80 | 28 | | 8 | strpos | 55.07% | 24 | 29 | | 9 | array_merge | 54.80% | 35 | 30 | | 10 | in_array | 51.39% | 33 | 31 | | 11 | explode | 51.35% | 26 | 32 | | 12 | strlen | 50.97% | 35 | 33 | | 13 | is_array | 50.73% | 46 | 34 | | 14 | array_key_exists | 49.54% | 28 | 35 | | 15 | array_keys | 49.27% | 16 | 36 | | 16 | preg_match | 46.52% | 28 | 37 | | 17 | file_get_contents | 46.48% | 8 | 38 | | 18 | is_file | 44.43% | 6 | 39 | | 19 | array_values | 42.81% | 7 | 40 | | 20 | file_put_contents | 42.46% | 4 | 41 | | 21 | trim | 41.57% | 25 | 42 | | 22 | method_exists | 41.49% | 8 | 43 | | 23 | defined | 40.87% | 19 | 44 | | 24 | is_string | 40.76% | 20 | 45 | | 25 | function_exists | 40.29% | 20 | 46 | | 26 | array_map | 39.33% | 12 | 47 | | 27 | preg_replace | 39.02% | 17 | 48 | | 28 | strtolower | 38.94% | 19 | 49 | | 29 | is_dir | 38.67% | 6 | 50 | | 30 | strtr | 38.01% | 5 | 51 | | 31 | call_user_func | 37.01% | 4 | 52 | | 32 | strrpos | 36.70% | 4 | 53 | | 33 | call_user_func_array | 36.43% | 3 | 54 | | 34 | array_flip | 35.89% | 2 | 55 | | 35 | fwrite | 35.89% | 4 | 56 | | 36 | rtrim | 35.69% | 6 | 57 | | 37 | filter_var | 35.65% | 2 | 58 | | 38 | ini_get | 35.15% | 5 | 59 | | 39 | json_decode | 34.76% | 7 | 60 | | 40 | array_filter | 34.76% | 7 | 61 | | 41 | realpath | 34.15% | 4 | 62 | | 42 | header | 34.07% | 7 | 63 | | 43 | class_exists | 34.03% | 12 | 64 | | 44 | json_encode | 33.49% | 9 | 65 | | 45 | trigger_error | 32.95% | 5 | 66 | | 46 | get_class | 32.95% | 13 | 67 | | 47 | spl_autoload_register | 32.10% | 1 | 68 | | 48 | unlink | 30.43% | 5 | 69 | | 49 | headers_sent | 29.78% | 1 | 70 | | 50 | is_object | 29.31% | 11 | 71 | | 51 | mkdir | 29.20% | 2 | 72 | | 52 | array_shift | 28.69% | 6 | 73 | | 53 | spl_autoload_unregister | 28.54% | 1 | 74 | | 54 | apcu_fetch | 28.23% | 0 | 75 | | 55 | array_pop | 28.11% | 5 | 76 | | 56 | stream_resolve_include_path | 27.84% | 0 | 77 | | 57 | is_int | 27.65% | 5 | 78 | | 58 | apcu_add | 27.57% | 0 | 79 | | 59 | getcwd | 27.49% | 1 | 80 | | 60 | strtoupper | 27.42% | 6 | 81 | | 61 | is_numeric | 26.95% | 9 | 82 | | 62 | array_unique | 26.91% | 4 | 83 | | 63 | ltrim | 26.60% | 4 | 84 | | 64 | basename | 26.57% | 4 | 85 | | 65 | str_repeat | 26.26% | 7 | 86 | | 66 | fopen | 25.91% | 6 | 87 | | 67 | array_slice | 24.94% | 3 | 88 | | 68 | getenv | 24.94% | 4 | 89 | | 69 | var_export | 24.71% | 3 | 90 | | 70 | preg_match_all | 24.67% | 3 | 91 | | 71 | is_callable | 24.48% | 4 | 92 | | 72 | reset | 24.44% | 4 | 93 | | 73 | preg_split | 24.40% | 3 | 94 | | 74 | fclose | 24.36% | 5 | 95 | | 75 | array_unshift | 24.25% | 3 | 96 | | 76 | gettype | 24.21% | 4 | 97 | | 77 | end | 23.90% | 3 | 98 | | 78 | array_search | 23.82% | 3 | 99 | | 79 | max | 23.78% | 5 | 100 | | 80 | extension_loaded | 23.59% | 3 | 101 | | 81 | is_bool | 23.55% | 2 | 102 | | 82 | version_compare | 22.82% | 3 | 103 | | 83 | preg_quote | 22.78% | 3 | 104 | | 84 | time | 22.70% | 9 | 105 | | 85 | ucfirst | 22.66% | 4 | 106 | | 86 | ksort | 22.66% | 2 | 107 | | 87 | preg_replace_callback | 22.54% | 3 | 108 | | 88 | md5 | 22.51% | 4 | 109 | | 89 | array_reverse | 22.47% | 2 | 110 | | 90 | array_diff | 22.12% | 2 | 111 | | 91 | is_readable | 22.00% | 1 | 112 | | 92 | microtime | 21.96% | 4 | 113 | | 93 | copy | 21.81% | 1 | 114 | | 94 | parse_url | 21.81% | 2 | 115 | | 95 | is_null | 21.50% | 17 | 116 | | 96 | base64_encode | 21.42% | 3 | 117 | | 97 | current | 21.38% | 2 | 118 | | 98 | is_resource | 21.08% | 3 | 119 | | 99 | serialize | 20.77% | 4 | 120 | | 100 | key | 20.57% | 2 | 121 | 122 | Source: https://www.exakat.io/en/the-100-php-functions/ 123 | -------------------------------------------------------------------------------- /array.php: -------------------------------------------------------------------------------- 1 | "a", 12 | 5=>"b", 13 | 10=>"c" 14 | ]; 15 | print_r(array_keys($list)); 16 | 17 | $list = [ 18 | "a", 19 | 5=>"b", 20 | "c" 21 | ]; 22 | print_r($list); 23 | print_r(array_keys($list)); 24 | 25 | $list = [ 26 | "a", 27 | "sallam"=>"b", 28 | "c" 29 | ]; 30 | print_r($list); 31 | print_r(array_keys($list)); 32 | 33 | $list = [ 34 | "a", 35 | 3=>"xx", 36 | "sallam"=>"b", 37 | "c" 38 | ]; 39 | print_r($list); 40 | print_r(array_keys($list)); 41 | -------------------------------------------------------------------------------- /array_map.php: -------------------------------------------------------------------------------- 1 | $number) { 70 | $a[$i] = $multiply($number); 71 | } 72 | -------------------------------------------------------------------------------- /array_merge.php: -------------------------------------------------------------------------------- 1 | "a", 18 | "b", 19 | "c", 20 | 56=>"a", 21 | 51=>"a", 22 | 50=>"a" 23 | ]; 24 | print_r($list); 25 | 26 | $list = array_unique($list); 27 | print_r($list); 28 | -------------------------------------------------------------------------------- /array_unshift.php: -------------------------------------------------------------------------------- 1 | "red", "b" => "green"); 4 | $b = array_values($a); 5 | print_r($b); 6 | 7 | $a = [ 8 | 0 => "a", 9 | 10 => "b", 10 | 20 => "c", 11 | 30 => "d", 12 | 40 => "e", 13 | 50 => "f", 14 | ]; 15 | $b = array_values($a); 16 | print_r($b); 17 | 18 | $names = [ 19 | "reza", 20 | "hamid", 21 | "ali", 22 | "farzad", 23 | "reza", 24 | "abbas", 25 | "amirreza", 26 | "far" 27 | ]; 28 | unset($names[0]); 29 | unset($names[5]); 30 | print_r($names); 31 | $names = array_values($names); 32 | print_r($names); 33 | 34 | 35 | -------------------------------------------------------------------------------- /asort.php: -------------------------------------------------------------------------------- 1 | "lemon", 6 | "a" => "orange", 7 | "b" => "banana", 8 | "c" => "apple" 9 | ]; 10 | print_r($fruits); 11 | asort($fruits); 12 | print_r($fruits); 13 | -------------------------------------------------------------------------------- /call_user_func.php: -------------------------------------------------------------------------------- 1 | " convert to ">" 9 | ... 10 | */ 11 | $str = "The word text is bold"; 12 | echo htmlspecialchars($str); 13 | // HTML output will be "The word <b>text</> is bold" 14 | 15 | $str = "My name is 'Ali'"; 16 | echo htmlspecialchars($str); 17 | 18 | $str = "What is decrement & increment ?"; 19 | echo htmlspecialchars($str); -------------------------------------------------------------------------------- /implode.php: -------------------------------------------------------------------------------- 1 | 11 | -------------------------------------------------------------------------------- /is_bool.php: -------------------------------------------------------------------------------- 1 | {"123"} = "000"; 4 | $obj->a = "a"; 5 | $obj->b = "b"; 6 | $obj->c = "c"; 7 | $obj->d = "d"; 8 | 9 | print_r($obj); 10 | 11 | var_dump(is_object($obj)); 12 | var_dump(is_object($obj->a)); 13 | var_dump(is_object([])); 14 | 15 | $list = [ 1, 2, 3, 4, 5 ]; 16 | $list[6] = 100; 17 | var_dump(is_object($list)); 18 | 19 | // A quick look to Class 20 | class Car { 21 | 22 | } 23 | $peraid = new Car(); 24 | $pershia = new Car(); 25 | var_dump(is_object($peraid)); 26 | var_dump(is_object($pershia)); 27 | -------------------------------------------------------------------------------- /is_readable.php: -------------------------------------------------------------------------------- 1 | 'apple', 5 | 'fruit2' => 'orange', 6 | 'fruit3' => 'grape', 7 | 'fruit4' => 'apple', 8 | 'fruit5' => 'apple' 9 | ]; 10 | 11 | var_dump(key($array)); 12 | var_dump(next($array)); 13 | var_dump(key($array)); 14 | var_dump(next($array)); 15 | var_dump(key($array)); 16 | var_dump(next($array)); 17 | var_dump(key($array)); 18 | var_dump(next($array)); 19 | var_dump(key($array)); 20 | 21 | // what about if we go to end of a list 22 | var_dump(next($array)); 23 | var_dump(key($array)); 24 | 25 | $list = [ 26 | 100, 27 | 200, 28 | 300 29 | ]; 30 | var_dump(key($list)); 31 | -------------------------------------------------------------------------------- /krsort.php: -------------------------------------------------------------------------------- 1 | "lemon", 6 | "a" => "orange", 7 | "b" => "banana", 8 | "c" => "apple" 9 | ]; 10 | print_r($fruits); 11 | krsort($fruits); 12 | print_r($fruits); 13 | -------------------------------------------------------------------------------- /ksort.php: -------------------------------------------------------------------------------- 1 | "lemon", 6 | "a" => "orange", 7 | "b" => "banana", 8 | "c" => "apple" 9 | ]; 10 | print_r($fruits); 11 | ksort($fruits); 12 | print_r($fruits); 13 | 14 | ksort($fruits); 15 | $fruits = array_reverse($fruits); 16 | print_r($fruits); 17 | -------------------------------------------------------------------------------- /max.php: -------------------------------------------------------------------------------- 1 | "lemon", 6 | "a" => "orange", 7 | "b" => "banana", 8 | "c" => "apple" 9 | ]; 10 | print_r($fruits); 11 | sort($fruits); 12 | print_r($fruits); 13 | 14 | rsort($fruits); 15 | print_r($fruits); 16 | -------------------------------------------------------------------------------- /sort.php: -------------------------------------------------------------------------------- 1 | %s", "Hello", "World"); 10 | var_dump($str); 11 | 12 | $str = sprintf("hi, there, it's me? HOW ARE YOU?\n%s (%d)", "Hello", 100); 13 | var_dump($str); 14 | 15 | $str = sprintf("hi, there, it's me? HOW ARE YOU?"); 16 | var_dump($str); 17 | 18 | $str = "Hello" . " " . "World"; 19 | var_dump($str); 20 | 21 | $age = 100; 22 | $str = "Hello $age"; 23 | var_dump($str); 24 | 25 | function testme() { 26 | return "MAX"; 27 | } 28 | 29 | $age = 100; 30 | $str = "Hello $age" . testme(); 31 | var_dump($str); 32 | 33 | $age = 100; 34 | $str = "Hello {$age} testme()"; 35 | var_dump($str); 36 | 37 | $list = [ 38 | "ali", 39 | "reza", 40 | "hamid" 41 | ]; 42 | $str = "Hello {$list[0]} {$list[1]} {$list[2]}"; 43 | var_dump($str); 44 | 45 | // $age = 10; 46 | // Error: $str = "$agehi"; 47 | // var_dump($str); 48 | 49 | $age = 10; 50 | $str = "$age hi"; 51 | var_dump($str); 52 | 53 | $age = 10; 54 | $str = "$age" . " hi"; 55 | var_dump($str); 56 | 57 | $age = 10; 58 | $str = $age . " hi"; 59 | var_dump($str); 60 | 61 | $age = 10; 62 | $str = "{$age}hi"; 63 | var_dump($str); 64 | 65 | 66 | var_dump(sprintf("%d", "100")); 67 | var_dump(sprintf("%f", 3.14)); 68 | var_dump(sprintf("%g", 3.14)); 69 | var_dump(sprintf("%.3f", 3.14)); 70 | var_dump(sprintf("%.3f", 10)); 71 | 72 | // string s 73 | // int d, u, c, o, x, X, b 74 | // float e, E, f, F, g, G, h, H 75 | -------------------------------------------------------------------------------- /str_repeat.php: -------------------------------------------------------------------------------- 1 | "!", 34 | // "b" => "@", 35 | // "c" => "#" 36 | // ]; 37 | // var_dump( strtr($str, $action) ); 38 | 39 | $pairs = [ 40 | "h" => "-", 41 | "hello" => "hi", 42 | "hi" => "hello" 43 | ]; 44 | // hello all, I said hi 45 | // hello all, I said hi 46 | // hello all, I said hi - 47 | // hello all, I said hi - -o 48 | echo strtr("hi all, I said hello h ho", $pairs); 49 | // The two modes of behavior are substantially different. 50 | // With three arguments, strtr() will replace bytes; with two, 51 | // it may replace longer substrings. 52 | 53 | print "\n"; 54 | 55 | $pairs = [ 56 | "h" => "-", 57 | "hilow" => "SSSSS", 58 | "hi" => "hello" 59 | ]; 60 | echo strtr("hi all, I said hello h ho", $pairs); 61 | // hello all, I said -ello - -o 62 | print "\n"; 63 | 64 | echo strtr("hi all, I said hilow hiloX h ho", $pairs); 65 | // hello all, I said SSSSS - -o 66 | 67 | print "\n===================\n"; 68 | 69 | $dict = [ 70 | "hello" => "سلام", 71 | "bye" => "خداحافظ", 72 | "how are you" => "چطوری؟", 73 | "hey" => "هوی!" 74 | ]; 75 | echo strtr("hello bye how are you hey", $dict); 76 | // سلام خداحافظ چطوری؟ هوی! 77 | -------------------------------------------------------------------------------- /substr.php: -------------------------------------------------------------------------------- 1 | = 0) { 7 | print 'yes'; 8 | } else { 9 | print 'no'; 10 | } 11 | 12 | if (version_compare('1.3.4', '7.0.0') >= 0) { 13 | print 'yes'; 14 | } else { 15 | print 'no'; 16 | } 17 | 18 | if (version_compare('1.3.4', '7.0.0') < 0) { 19 | print 'yes'; 20 | } else { 21 | print 'no'; 22 | } 23 | 24 | --------------------------------------------------------------------------------