大部分情況下我們更新處理數(shù)據(jù)都是在觸發(fā)事件的時候去執(zhí)行它，但是有的時候我們需要無人值守的情況下，定時的去執(zhí)行一些任務(wù)，就想鬧鐘一樣，由程序去執(zhí)行任務(wù)。
下面實現(xiàn)定時執(zhí)行的代碼：
定時任務(wù)輔助類
Class TimingAuxiliary
class  TimingAuxiliary {
public $dir = '/Timing'; //定時執(zhí)行器所在的文件目錄
    public $url; //要執(zhí)行的鏈接地址
    public $startFileName; //開關(guān)文件路徑
    public $interval; //間隔時間
public $protocol; //鏈接協(xié)議
public function __construct($url, $startFileName, $interval, $protocol = 'http://', $dir = '') {
        //驗證值
        if (!$url || !$startFileName || !$interval) {
            return '請指定完整的數(shù)據(jù)';
        }
        $this->url = $url;
        $this->startFileName = $startFileName;
        $this->interval = $interval;
        $this->protocol = $protocol;
        $this->dir = $dir ? $dir : $this->dir;
    }
    /**
     * 訪問執(zhí)行
     * @return mixed
     */
 public function run() {
 $url = $this->protocol . $_SERVER['SERVER_NAME'] . . $this->dir . "/TimingRun.php?url=" . urlencode($this->url) . '&file=' . urlencode($this->startFileName) . '&interval=' . $this->interval;
        $hander = curl_init();
        curl_setopt($hander, CURLOPT_URL, $url);
        curl_setopt($hander, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($hander, CURLOPT_HEADER, 0);
        curl_setopt($hander, CURLOPT_TIMEOUT, 20);
        $result = curl_exec($hander);
        return $result;
    }
}
 
 
* 定時處理類 Timing.class.php
class  Timing {
    public $interval = 1; //間隔時間
    public $startFileName = "timing_stop.txt"; //停止文件,填寫其完整路徑
    public $url = ''; //需要定時執(zhí)行的地址
 
    /**
     * @param $url
     * @param string $startFileName
     * @param int $interval
     */
    public function __construct($url, $startFileName = '', $interval = 0) {
        $this->url = $url;
        $this->startFileName = $startFileName ? $startFileName : $this->startFileName;
        $this->interval = $interval ? $interval : $this->interval;
    }
 
    /**
     * 執(zhí)行調(diào)用
     * @return string
     */
    public function run() {
        //判斷是否指定了url
        if (!$this->url) {
            return 'url必須指定';
        }
        $stopfile = fopen($this->startFileName, "a"); //初始生成文件
        $result = "地址:" . $this->url . "啟動成功|占內(nèi)存:" . memory_get_usage() . "\r\n";
        fwrite($stopfile, $result);
        fclose($stopfile);
        ignore_user_abort(); //即使Client斷開(如關(guān)掉瀏覽器)，PHP腳本也可以繼續(xù)執(zhí)行.
        set_time_limit(0);
        $interval = $this->interval;
        $start = file_exists($this->startFileName);
        do {
            //curl比file_get_contents性能要高
            $hander = curl_init();
            curl_setopt($hander, CURLOPT_URL, $this->url);
            curl_setopt($hander, CURLOPT_RETURNTRANSFER, 1);
            curl_setopt($hander, CURLOPT_HEADER, 0);
            curl_setopt($hander, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)");
            curl_setopt($hander, CURLOPT_TIMEOUT, 30);
            curl_exec($hander);
            sleep($interval);
            $start = file_exists($this->startFileName);
            flush(); //刷新輸出緩沖
        } while ($start);
    }
}
 

 
TimingRun.class.php
 
/**
 * 中間調(diào)用器
 */
header("Content-Type:text/html;charset=utf-8");
error_reporting(E_ALL ^ E_NOTICE);
include 'Timing.class.php';
//執(zhí)行任務(wù)
$url = urldecode($_GET['url']);
$file = urldecode($_GET['file']);
$interval = $_GET['interval'];
$Timing = new Timing($url, $file, $interval);
$Timing->run();
這里是調(diào)用定時器，和處理的事件，這里只是向test.txt 寫入文字，最好是寫錄日志，可以查看定時器執(zhí)行的狀況；
public function timerun() {
        $curl = "http://" . $_SERVER['SERVER_NAME'] . U('Crons/timecs');
        $file = 'log.txt'; //刪除即停止執(zhí)行。此處路徑默認(rèn)為.'/Timing/'下的文件可以下成的實列化中定義
        import("Org.Util.TimingAuxiliary");
        $re = new \TimingAuxiliary($curl, $file, 2);
        $re->run();
 
    }
 
    /**
     * 定時執(zhí)行的任務(wù)
     */
    public function timecs() {
           $time=time();
           $fp = fopen('..' . . '/Timing/test.txt', 'a');
           $content='這是我要寫入的內(nèi)容';
           $time=time();
           $re = fwrite($fp, $content . memory_get_usage() . "\r\n");
      
}
 
最后只要運行  timerun()然后關(guān)掉就可以了