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PHP array_filter_recursive function
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<?php | |
/** | |
* Exactly the same as array_filter except this function | |
* filters within multidimensional arrays | |
* | |
* @param array $array | |
* @param callable|null $callback optional filter callback function | |
* @param bool $remove_empty_arrays optional flag removal of empty arrays after filtering | |
* | |
* @return array filtered array | |
*/ | |
function array_filter_recursive(array $array, callable $callback = null, bool $remove_empty_arrays = false): array { | |
foreach ($array as $key => & $value) { // mind the reference | |
if (is_array($value)) { | |
$value = call_user_func_array(__FUNCTION__, array($value, $callback, $remove_empty_arrays)); | |
if ($remove_empty_arrays && ! (bool) $value) { | |
unset($array[$key]); | |
} | |
} | |
else { | |
if ( ! is_null($callback) && ! $callback($value)) { | |
unset($array[$key]); | |
} | |
elseif ( ! (bool) $value) { | |
unset($array[$key]); | |
} | |
} | |
} | |
unset($value); // kill the reference | |
return $array; | |
} |
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or you can use call_user_func_array to "free" the function's name