Sample code for how PHP detects URLs that exist

This article mainly introduces the PHP detection URL is the method of existence, involving PHP get_headers and regular matching skills, very practical value, the need for friends can refer to the following

The example in this article describes the method by which PHP detects whether a URL exists. Share to everyone for your reference. Specific as follows:

The code is as follows:

function Url_exists ($url) {    $hdrs = @get_headers ($url);    Return Is_array ($hdrs)? Preg_match ('/^http\\/\\d+\\.\\d+\\s+2\\d\\d\\s+.*$/', $hdrs [0]): false;}