Check multiple array keys exist with PHP

I was recently checking the integrity of some JSON that came from user input. This function is useful for checking you have a specific list of keys in an associative array.

					
function multipleArrayKeysExists($array, $keys) {

    $requiredKeys = $keys;
    $actualKeys   = array_keys($array);

    sort($requiredKeys);
    sort($actualKeys);

    if ($requiredKeys !== $actualKeys) {

        return false;

    }

    return true;

}