大部分情况下我们更新处理数据都是在触发事件的时候去执行它，但是有的时候我们需要无人值守的情况下，定时的去执行一些任务，就想闹钟一样，由程序去执行任务。
下面实现定时执行的代码：
定时任务辅助类
Class TimingAuxiliary
class  TimingAuxiliary {
public $dir = '/Timing'; //定时执行器所在的文件目录
    public $url; //要执行的链接地址
    public $startFileName; //开关文件路径
    public $interval; //间隔时间
public $protocol; //链接协议
public function __construct($url, $startFileName, $interval, $protocol = 'http://', $dir = '') {
        //验证值
        if (!$url || !$startFileName || !$interval) {
            return '请指定完整的数据';
        }
        $this->url = $url;
        $this->startFileName = $startFileName;
        $this->interval = $interval;
        $this->protocol = $protocol;
        $this->dir = $dir ? $dir : $this->dir;
    }
    /**
     * 访问执行
     * @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;
    }
}
 
 
* 定时处理类 Timing.class.php
class  Timing {
    public $interval = 1; //间隔时间
    public $startFileName = "timing_stop.txt"; //停止文件,填写其完整路径
    public $url = ''; //需要定时执行的地址
 
    /**
     * @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;
    }
 
    /**
     * 执行调用
     * @return string
     */
    public function run() {
        //判断是否指定了url
        if (!$this->url) {
            return 'url必须指定';
        }
        $stopfile = fopen($this->startFileName, "a"); //初始生成文件
        $result = "地址:" . $this->url . "启动成功|占内存:" . memory_get_usage() . "\r\n";
        fwrite($stopfile, $result);
        fclose($stopfile);
        ignore_user_abort(); //即使Client断开(如关掉浏览器)，PHP脚本也可以继续执行.
        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(); //刷新输出缓冲
        } while ($start);
    }
}
 

 
TimingRun.class.php
 
/**
 * 中间调用器
 */
header("Content-Type:text/html;charset=utf-8");
error_reporting(E_ALL ^ E_NOTICE);
include 'Timing.class.php';
//执行任务
$url = urldecode($_GET['url']);
$file = urldecode($_GET['file']);
$interval = $_GET['interval'];
$Timing = new Timing($url, $file, $interval);
$Timing->run();
这里是调用定时器，和处理的事件，这里只是向test.txt 写入文字，最好是写录日志，可以查看定时器执行的状况；
public function timerun() {
        $curl = "http://" . $_SERVER['SERVER_NAME'] . U('Crons/timecs');
        $file = 'log.txt'; //删除即停止执行。此处路径默认为.'/Timing/'下的文件可以下成的实列化中定义
        import("Org.Util.TimingAuxiliary");
        $re = new \TimingAuxiliary($curl, $file, 2);
        $re->run();
 
    }
 
    /**
     * 定时执行的任务
     */
    public function timecs() {
           $time=time();
           $fp = fopen('..' . . '/Timing/test.txt', 'a');
           $content='这是我要写入的内容';
           $time=time();
           $re = fwrite($fp, $content . memory_get_usage() . "\r\n");
      
}
 
最后只要运行  timerun()然后关掉就可以了