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<?php $a = [0,1,2,3,4,[10,20,30]]; $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( $v ); continue; } } } }; array_walk($a, $callback); print_r($nu_array); $b = []; array_walk_recursive($a, function ( $item ) use(&$b ) { $b[] = $item; } ); print_r($b);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.27, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 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] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 10 [6] => 20 [7] => 30 ) Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 10 [6] => 20 [7] => 30 )
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] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 10 [6] => 20 [7] => 30 ) Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 10 [6] => 20 [7] => 30 )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/O0BmK on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/O0BmK on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/O0BmK on line 2
Process exited with code 255.

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