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<?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($value); } }); print_r($result); function array_walk_recursive_delete(array &$array, callable $callback, $userdata = null) { foreach ($array as $key => &$value) { if (is_array($value)) { $value = array_walk_recursive_delete($value, $callback, $userdata); } if ($callback($value, $key, $userdata)) { unset($array[$key]); } } return $array; }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.2.19, 8.3.0 - 8.3.7
Array ( [a] => a [b] => [c] => Array ( [a] => [b] => b ) [d] => Array ( [a] => ) )
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/Y5ZJ2 on line 20 and defined in /in/Y5ZJ2 on line 26
Process exited with code 255.
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/Y5ZJ2 on line 14
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/Y5ZJ2 on line 14
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Y5ZJ2 on line 14
Process exited with code 255.
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