php系列----->通过PHP数组实现队列

废话少说，上代码（talk is easy ,show me the code）:<?php/** * 通过 PHP 数组实现的队列 */class SimpleQueue{    private $_queue = [];    private $_size = 0;    public function __construct($size = 10)    {        $this->_size = $size;    }    // 入队    public function enqueue($value)    {        if (count($this->_queue) > $this->_size) {            return false;        }        array_push($this->_queue, $value);    }    // 出队    public function dequeue()    {        if (count($this->_queue) == 0) {            return false;        }        return array_shift($this->_queue);    }    public function size()    {        return count($this->_queue);    }}$queue = new SimpleQueue(5);$queue->enqueue(1);$queue->enqueue(3);$queue->enqueue(5);var_dump($queue->dequeue());  # 1var_dump($queue->size());  # 2