PHP code implements two-way queue

This article mainly shares with you the php code to implement a two-way queue. It is mainly shared with you in the form of code. I hope it can help you.

<?phpclass Deque {

    private $queue = array();    public function addFirst($item) {
        return array_unshift($this->queue, $item);
    }    public function addLast($item) {
        return array_push($this->queue, $item);
    }    public function removeFirst() {
        return array_shift($this->queue);
    }    public function removeLast() {
        return array_pop($this->queue);
    }
}

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