PHP obtains the true URL address after 301 redirection page jump

Today, I saw a friend using phpsocket to obtain the address after the 301 jump. In fact, we still have a very simple method, that is, using the phpget_headers () function to obtain the number of http header information, let's take a look at our... today, I saw a friend using php socket to get the address after the 301 jump. In fact, we still have a very simple method, that is, using php get_headers () the function obtains the number of http headers. let's take a look at our implementation method.

The code is as follows:

function getrealurl($url){  $header = get_headers($url,1);  if (strpos($header[0],'301') || strpos($header[0],'302')) {   if(is_array($header['Location'])) {    return $header['Location'][count($header ['Location'])-1];   }else{    return $header['Location'];   }  }else {   return $url;  } }

Supplement: get_headers obtains all the headers sent by the server in response to an HTTP request. the code is as follows:

$ Url = 'http: // phprm.com '; print_r (get_headers ($ url ));

The code is as follows:

Array (     [0] => HTTP/1.1 301 Moved Permanently     [1] => Date: Tue, 01 Jul 2014 07:49:26 GMT     [2] => Server: Apache/2.2.22 (Win32) PHP/5.2.17     [3] => Location: http://www.phprm.com/     [4] => Content-Length: 314     [5] => Content-Type: text/html; charset=iso-8859-1     [6] => X-Via: 1.1 jszjsx60:8080 (Cdn Cache Server V2.0), 1.1 zb51:6 (Cdn Cache Server V2.0)     [7] => Connection: close     [8] => HTTP/1.1 200 OK     [9] => Date: Tue, 01 Jul 2014 07:49:27 GMT     [10] => Server: Apache/2.2.22 (Win32) PHP/5.2.17     [11] => Last-Modified: Tue, 01 Jul 2014 07:41:43 GMT     [12] => ETag: "7a0000002fe1a1-68a9-4fd1ce83bc0f7"     [13] => Accept-Ranges: bytes     [14] => Content-Length: 26793     [15] => Content-Type: text/html     [16] => X-Via: 1.1 jszjsx60:8080 (Cdn Cache Server V2.0), 1.1 zb62:5 (Cdn Cache Server V2.0)     [17] => Connection: close )

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