Find the Array key in Nested Array

In nested array find the array key for matched value

function recursive_array_search($needle, $haystack) {
    foreach($haystack as $key=>$value) {
        $current_key = $key;
        if($needle === $value
  || (is_array($value) && recursive_array_search($needle,$value) !== false)) {
            return $current_key;
        }
    }
    return false;
}

Find the key of the matched element in nested array.

$needle

- String which has to find.

$haystack

- Array elements $needle has to search in this array.