3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array(); $a = [0,1,2,3,4,5]; $b = [0,1,2,3,4,5]; $c = [0,1,2,3,4,5]; $d = [0,1,2,3,4,5]; $e = [0,1,2,3,4,5]; $f = [0,1,2,3,4,5]; $g = [0,1,2,3,4,5]; $arr[] = $a; $arr[] = $b; $arr[] = $c; $arr[0][2] = $d; $arr[0][2][3] = $e; $arr[2][1] = $f; $arr[1] = $g; print_r($arr); function array_keys_recur($myArray, $MAXDEPTH = INF, $depth = 0, $arrayKeys = array()){ if($depth < $MAXDEPTH){ $depth++; $keys = array_keys($myArray); foreach($keys as $key){ if(is_array($myArray[$key])){ $arrayKeys[$key] = array_keys_recursive($myArray[$key], $MAXDEPTH, $depth); } } } return $arrayKeys; } $keys = array_keys_recur($arr); print_r($keys);
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Array ( [0] => Array ( [0] => 0 [1] => 1 [2] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [4] => 4 [5] => 5 ) [3] => 3 [4] => 4 [5] => 5 ) [1] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [2] => Array ( [0] => 0 [1] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) ) Fatal error: Uncaught Error: Call to undefined function array_keys_recursive() in /in/u2JPj:27 Stack trace: #0 /in/u2JPj(35): array_keys_recur(Array) #1 {main} thrown in /in/u2JPj on line 27
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [0] => Array ( [0] => 0 [1] => 1 [2] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [4] => 4 [5] => 5 ) [3] => 3 [4] => 4 [5] => 5 ) [1] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [2] => Array ( [0] => 0 [1] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) ) Fatal error: Uncaught Error: Call to undefined function array_keys_recursive() in /in/u2JPj:27 Stack trace: #0 /in/u2JPj(35): array_keys_recur(Array) #1 {main} thrown in /in/u2JPj on line 27
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Array ( [0] => Array ( [0] => 0 [1] => 1 [2] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [4] => 4 [5] => 5 ) [3] => 3 [4] => 4 [5] => 5 ) [1] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [2] => Array ( [0] => 0 [1] => Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) [2] => 2 [3] => 3 [4] => 4 [5] => 5 ) ) Fatal error: Call to undefined function array_keys_recursive() in /in/u2JPj on line 27
Process exited with code 255.

preferences:
241.92 ms | 403 KiB | 371 Q