如何在PHP服务器端检查网站的网址是否有效? [英] How to PHP server-side check if a url of a web site is valid?

问题描述

我已经搜索了SO问题，但发现解决方案是基于调用ping通过使用system PHP函数执行的命令.

I've searched our SO questions but found solutions are based on calling ping command executed from using system PHP function.

我的Web主机服务器不允许我这样做.我该怎么办?

My web host server doesn't allow me to do that. What should I do?

请帮助， 南

更新

我需要从server side检查.

推荐答案

如果通过有效的URL表示不是404的URL，则可以使用

If by a valid URL you mean one which does not 404, then you could use get_headers() and look for 404 in the first returned array element.

$url = 'http://google.com';
list($status) = get_headers($url);
if (strpos($status, '404') !== FALSE) {
   // URL is 404ing
}

或者，您可以寻找200，这将是一个正常的快乐请求:)

Alternatively, you could look for 200 which would be a normal happy request :)

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