Error Handling

public function sort($numberOfWords = null, $alphabet = null, $wordList = null)
    {
        $passedArgumentsArray = func_get_args();

        if(count($passedArgumentsArray) != 3) {
            trigger_error("3 Arguments must be passed to" . __FUNCTION__,E_USER_ERROR);
        } else if(empty($passedArgumentsArray)) {
            trigger_error("No args passed to " . __FUNCTION__,E_USER_ERROR);
        } else if(empty($passedArgumentsArray[0])) {
            trigger_error("First arg cannot be NULL",E_USER_ERROR);
        } else if(empty($passedArgumentsArray[1])) {
            trigger_error("Second arg cannot be NULL",E_USER_ERROR);
        }
}