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HomeBackend DevelopmentPHP Tutorialphp定时计划任务的实现方法

最近由于项目需要定时对远程数据库上做一些处理,这里就需要做一个计划任务样子的东西了。

经过努力,终于使用php实现了这个定时计划任务,下面分享一下此次的实现过程。本次使用php实现计划任务主要使用了

 ignore_user_abort() set_time_limit(0) sleep() 这三个函数。

具体的代码如下:

<p><?php</p>ignore_user_abort();//该函数的作用是当用户关掉浏览器后,PHP脚本也可以继续执行.<br />set_time_limit(3000);// 通过set_time_limit(0)可以让程序无限制的执行下去<br />$interval=5;// 每隔5s运行<br />//方法1--死循环<br />do{<br />echo '测试'.time().'<br/>'; <br />sleep($interval);// 等待5s    <br />}while(true);<br />//方法2---sleep 定时执行<br />require_once './curlClass.php';//引入文件<br />$curl=new httpCurl('www.phpernote.com');//实例化<br />$stime=$curl->getmicrotime();<br />for($i=0;$i<=10;$i++){<br />echo '测试'.time().'<br/>'; <br />sleep($interval);// 等待5s<br />}<br />ob_flush();<br />flush();<br />$etime=$curl->getmicrotime();<br />echo '<hr>';<br /><p>echo round(($etime-stime),4);//程序执行时间</p>

在具体的实现过程中个人感觉PHP定时执行任务的效率并不高,建议关于定时执行任务的工作还是交给shell来做吧,相对来说,这个方法实现的太过勉强,而shell是专业级别的了。


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