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run code in 150+ php & hhvm versions
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<?php $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; } } } }; $array = array('alpha',array(1,2,3),'beta',array(7,8,array(9,10))); array_walk($array, $callback); print_r($nu_array);
based on 8Re69
Output for 5.3.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0RC5
Array ( [0] => alpha [1] => 1 [2] => 2 [3] => 3 [4] => beta [5] => 7 [6] => 8 [7] => 9 [8] => 10 )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/cJ9BK 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 T_FUNCTION in /in/cJ9BK on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/cJ9BK on line 3
Process exited with code 255.