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<?php $array = array("red"=>"apple","blue"=>"sky","orange"=>"juice"); $output = array(); // or, $output = null; $closure = function($element) use(&$output) { { $output[] = $element; } }; array_walk_recursive($array, $closure); print_r($output); /** Array ( [0] => apple [1] => sky [2] => juice ) **/
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.3.6
Array ( [0] => apple [1] => sky [2] => juice )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/FplQ3 on line 4
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 T_FUNCTION in /in/FplQ3 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/FplQ3 on line 4
Process exited with code 255.
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213.64 ms | 401 KiB | 328 Q