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run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = array( 'a' => 'a', 'b' => null, 'c' => array( 'a' => null, 'b' => 'b', ), 'd' => array( 'a' => null ) ); $result = array_walk_recursive_delete($array, function ($value, $key) { if (is_array($value)) { return empty($value); } }); echo"<pre>"; print_r($result); echo"<pre>"; function array_walk_recursive_delete(array &$array, callable $callback) { foreach ($array as $key => &$value) { if (is_array($value)) { $value = array_walk_recursive_delete($value, $callback); } if ($value == null) { unset($array[$key]); } } return $array; }
based on Y5ZJ2
Output for 5.4.0 - 7.2.0
<pre>Array ( [a] => a [c] => Array ( [b] => b ) ) <pre>
Output for 5.3.0 - 5.3.29
Catchable fatal error: Argument 2 passed to array_walk_recursive_delete() must be an instance of callable, instance of Closure given, called in /in/XVGeK on line 18 and defined in /in/XVGeK on line 23
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/XVGeK on line 14
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/XVGeK on line 14
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/XVGeK on line 14
Process exited with code 255.