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HomeBackend DevelopmentPHP Tutorialphp ignore_user_abort() 函数实现客户端断开脚本继续执行

ignore_user_abort() 可以实现当客户端关闭后仍然可以执行PHP代码,可保持PHP进程一直在执行,可实现所谓的计划任务功能与持续进程,只需要开启执行脚本,除非 apache 等服务器重启或有脚本有输出,该PHP脚本将一直处于执行的状态,初看很实用,不过代价是一个PHP执行脚本的持续进程,开销很大,但却可以 实现很多意想不到的功能。

定义和用法ignore_user_abort() 函数设置与客户机断开是否会终止脚本的执行。

本函数返回 user-abort 设置的之前的值(一个布尔值)。

语法ignore_user_abort(setting)参数 描述setting 可选。如果设置为 true,则忽略与用户的断开,如果设置为 false,会导致脚本停止运行。如果未设置该参数,会返回当前的设置。注释:PHP 不会检测到用户是否已断开连接,直到尝试向客户机发送信息为止。简单地使用 echo 语句无法确保信息发送,参阅 flush() 函数。

使用示例:

(1)结合set_time_limit()函数实现一个循环脚本执行任务

<p><?php</p><p>ignore_user_abort();</p><p>set_time_limit(0);</p><p>$interval=60*15;//说明:每隔15分钟循环执行</p><p>do{</p><p>//执行的业务</p><p>}while(true);</p>

(2)自定义实现文件输出并跟踪ignore_user_abort()函数的执行结果

<p><?php</p><p>ignore_user_abort(TRUE);</p><p>set_time_limit(0);</p><p>$interval=10;</p><p>$stop=1;</p><p>do{</p><p>    if($stop==10) break;</p><p>    file_put_contents('scutephp.com.php',' Current Time: '.time().' Stop: '.$stop);</p><p>    $stop++;</p><p>    sleep($interval);</p><p>}while(true);</p>

打开 scutephp.com.php 文件,文件内容如下: Current Time: 1273735029 Stop: 9其原理是即使客户端终止脚本,仍然每隔10秒钟执行一次,并打印出当前时间与终止点,这样就可以测试出ignore_user_abort()函数的具体效果。

通过实例发现使用 ignore_user_abort()函数在实现计划任务,持续进程等方面的业务时候还是非常实用的。


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