PHP 实现队列类 仅供参考
<?php/** * PHP Class for queue * @author [email protected] * @copyright DataFrog Beijingbei Ltd. 2011-07-25 */class Queue { public $length=12; public $queue = array(); // if String like this "22,23,24" convert to array to do queue public $delimiter=','; function __construct($queue=array()) { $this->queue=$queue; } /** * @desc start queue * @param String $param new queue element */ public function run($param) { if(!is_array($this->queue)){ $this->strToQue(); } $currentlength=$this->countqueue(); //Count the queue length if($currentlength<$this->length&&$this->length>0) { $this->queAdd($param); }else if($this->length=0) { $this->queue[]=$param; } else { $this->queRemove(); $this->queAdd($param); } return $this->queue; } /** * String like this "22,23,24" convert to array to do queue * @param String $string * @param String $delimiter */ public function strToQue (){ if (empty($this->queue)) { $this->queue=array(); } else { $this->queue=explode($this->delimiter,$this->queue); } } /** * insert $node into queue * @param string $node */ private function queAdd($node){ array_push($this->queue,$node); $this->countqueue(); } private function queRemove(){ $node = array_shift($this->queue); $this->countqueue(); return $node; } private function countqueue(){ $currentlength= count($this->queue); return $currentlength; } function __destruct() { unset($this->queue); }}//example $str='' ; //array();$obj=new Queue ($str);$obj->length=8; // 队列元素长度 $obj->delimiter='|'; //如果队列是字符串，则元素直接的分隔符为|$a=$obj->run('91'); //要添加到队列中的元素$a=$obj->run('92'); $a=$obj->run('93'); $a=$obj->run('94'); print_r($a); ?>
