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This article introduces the relevant knowledge of "what is the method for PHP to obtain redirected URL". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

PHP access redirect URL method: 1, use the get_headers function to get, syntax "get_headers ($url, 1)"; 2, use the fsockopen () function to get; 3, use curl_init (), curl_setopt () and other functions to get.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

1. Use the get_headers function

The get_headers function that comes with php can get all the headers sent by the server in response to a HTTP request, which we can try to implement.

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

2. Use the built-in function fsockopen ()

Function get_redirect_url ($url) {$redirect_url = false; $url_parts = @ parse_url ($url); if (! $url_parts) return false; if (! isset ($url_parts ['host'])) return false; if (! isset ($url_parts [' path'])) $url_parts ['path'] =' /'; $sock = fsockopen ($url_parts ['host'], isset ($url_parts [' port'])? (int) $url_parts ['port']: 80), $errno, $errstr, 30); if (! $sock) return false; $request = "HEAD". $url_parts ['path']. (isset ($url_parts ['query'])?. $url_parts [' query']: ")." HTTP/1.1\ r\ n "; $request. = 'Host:'. $url_parts ['host']. "\ r\ n"; $request. = "Connection: Close\ r\ n\ r\ n\ n"; fwrite ($sock, $request); $response = "; while (! feof ($sock)) $response. = fread ($sock, 8192); fclose ($sock); if (preg_match ('/ ^ Location: (. +?) $response, $matches) {return trim ($matches [1]);} else {return false;}}

3. Use the cURL function

Function get_redirect_url ($url, $referer= ", $timeout = 10) {$redirect_url = false; $ch = curl_init (); curl_setopt ($ch, CURLOPT_URL, $url); curl_setopt ($ch, CURLOPT_HEADER, TRUE); curl_setopt ($ch, CURLOPT_NOBODY, TRUE); / / No request body content curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, TRUE); / / allow requested links to jump curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE) Curl_setopt ($ch, CURLOPT_TIMEOUT, $timeout); curl_setopt ($ch, CURLOPT_HTTPHEADER, array ('Accept: * / *', 'User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)', 'Connection: Keep-Alive')); if ($referer) {curl_setopt ($ch, CURLOPT_REFERER, $referer); / / set referer} $content = curl_exec ($ch) If (! curl_errno ($ch)) {$redirect_url = curl_getinfo ($ch, CURLINFO_EFFECTIVE_URL); / / get the final requested url address} return $redirect_url;}

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