每次我们访问PHP脚本的时候,都是当所有的PHP脚本执行完成后,我们才得到返回结果。如果我们需要一个脚本持续的运行,那么我们就要通过php长连接的方式,来达到运行目的。
每个PHP脚本都限制了执行时间,所以我们需要通过 set_time_limit 来设置一个脚本的执行时间为无限长;然后使用 flush() 和 ob_flush() 来清除服务器缓冲区,随时输出脚本的返回值。
如下面这段脚本:
header("Content-Type: text/plain"); set_time_limit(0); $infoString = "Hello World" . "\n"; while( isset($infoString) ) { echo $infoString; flush(); ob_flush(); sleep(5); } ?> |
当我们执行后,每隔5秒钟,我们会得到一行 Hello World ,如果不按停止按钮,浏览器会不停的一行一行继续加载。
通过这一方法,我们可以完成很多功能,例如机器人爬虫、即时留言板等程序。

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