3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = [1,2,3,[5,6,7]]; $nu_array = null; $callback = function ( $item ) use(&$callback, &$nu_array) { if (!is_array($item)) { $nu_array[] = $item; } else if ( is_array( $item ) ) { foreach( array_values($item) as $v) { if ( !(is_array($v))) { $nu_array[] = $v; } else { $callback( $v ); continue; } } } }; array_walk($array, $callback); print_r($nu_array); $nu_array = []; array_walk_recursive($array, function ( $item ) use(&$nu_array ) { $nu_array[] = $item; } ); print_r($nu_array);
based on O0BmK
Output for 5.4.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.2.12
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 5 [4] => 6 [5] => 7 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 5 [4] => 6 [5] => 7 )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/3LaNc on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/3LaNc on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/3LaNc on line 3
Process exited with code 255.