开发始终运行PHP脚本 [英] Developing always running PHP script

问题描述

（我们的服务器是基于Linux的）

我是一个经验丰富的PHP开发人员，但我第一次开发一个机器人，它总是运行并获取一些数据。 / p>

我将用一个简单的（和示例）方案解释我的应用程序。我有大约2000网站url和我的应用程序将访问此网址和记录网页的内容。这个应用程序将工作7天24小时。它将开始工作，当它完成2000网站。

但我需要一些建议我的服务器。如您所见，我的应用程序将运行 infinity ，直到我关闭服务器。我可以这样做这个无限循环：

  while（true）
 {
应用程序代码这里
} 
  

但我认为这将是一个邪恶的服务器:)在服务器端可以做这样的事情吗？

我想使用 cronjobs ，但它不适用于我的场景。因为我的脚本开始工作，asap它完成工作。我必须完成工作后重新开始，而不是每30分钟开始。因为我不知道，也许获取所有2000个网站，将需要超过30分钟或不到30分钟。

我希望我解释得很好。 p>

我也担心内存使用。因为你知道垃圾收集器清除每个PHP脚本停止后的内存。但正如我所说，我的应用程序不会停止几天（也许几个星期）。所以垃圾回收器不会被触发。我手动取消设置（ unset（）函数）结束时所有使用的变量脚本。是否足够？

我需要服务器管理员的一些建议:)

strong>我将它开发为控制台应用程序，而不是Web应用程序。我可以从命令行执行它。

解决方案

您的脚本可以只运行一次列表并退出。这样，可以释放资源php持有的资源。

然后有一个shell脚本调用无限循环中的php脚本。

由于php不是为长时间运行的任务而设计的，我不确定垃圾收集是否由任务决定。每次运行后退出将会强制它释放一切。

(Our server is Linux based)

I'm an experienced PHP developer but first time i'll develop a bot which always running and fetch some datas.

I'll explain my application with a simple (and sample) scenario. I have about 2000 web site url and my application will visit this url's and record contents of web page's . This application will work 7 days 24 hours. It will start working again when it's finish 2000 web sites.

But i need some suggestions for my server. As you see, my application will be run infinity until i shut down server. I can do this infinity loop with this :

while(true)
{
     APPLICATION CODES HERE
}

But i think this will be an evil for server :) Is it possible to doing something like this, on server side?

Also i think using cronjobs but it's not work for my scenario. Because my script start working again asap it's finish working. I have to "start again when you finish your work" , not "start every 30 minutes" . Because i don't know, maybe fetching all 2000 websites, will take more than 30 minutes or less than 30 minutes.

I hope i explained it very well.

Also i'm worried about memory usage. As you know garbage collector cleans memory after every PHP script stop. But as i said, my app won't stop for days (maybe weeks) . So garbage collector won't be triggered. I'm manually unsetting (unset() function) all used variables at end of script. Is it enough?

I need some suggestions from server administrators :)

PS. I'm developing it as console application, not a web application. I can execute it from command line.

解决方案

Your script could just run through the list once and quit. That way, what ever resources php is holding can be freed.

Then have a shell script that calls the php script in an infinite loop.

As php is not designed for long running task, I am not sure if the garbage collection is up to the task. Quiting after every run will force it to release everything.

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