82 lines
No EOL
2.4 KiB
PHP
82 lines
No EOL
2.4 KiB
PHP
<?php
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/**
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* Code found at: http://w-shadow.com/blog/2008/07/05/how-to-get-redirect-url-in-php/
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*/
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class RedirectCheck
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{
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/**
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* get_redirect_url()
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* Gets the address that the provided URL redirects to,
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* or FALSE if there's no redirect.
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*
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* @param string $url
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* @return string
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*/
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function get_redirect_url($url){
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$redirect_url = null;
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$url_parts = @parse_url($url);
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if (!$url_parts) return false;
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if (!isset($url_parts['host'])) return false; //can't process relative URLs
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if (!isset($url_parts['path'])) $url_parts['path'] = '/';
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$sock = fsockopen($url_parts['host'], (isset($url_parts['port']) ? (int)$url_parts['port'] : 80), $errno, $errstr, 30);
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if (!$sock) return false;
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$request = "HEAD " . $url_parts['path'] . (isset($url_parts['query']) ? '?'.$url_parts['query'] : '') . " HTTP/1.1\r\n";
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$request .= 'Host: ' . $url_parts['host'] . "\r\n";
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$request .= "Connection: Close\r\n\r\n";
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fwrite($sock, $request);
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$response = '';
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while(!feof($sock)) $response .= fread($sock, 8192);
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fclose($sock);
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if (preg_match('/^Location: (.+?)$/m', $response, $matches)){
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if ( substr($matches[1], 0, 1) == "/" )
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return $url_parts['scheme'] . "://" . $url_parts['host'] . trim($matches[1]);
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else
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return trim($matches[1]);
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} else {
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return false;
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}
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}
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/**
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* get_all_redirects()
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* Follows and collects all redirects, in order, for the given URL.
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*
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* @param string $url
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* @return array
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*/
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function get_all_redirects($url){
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$redirects = array();
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while ($newurl = $this->get_redirect_url($url)){
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if (in_array($newurl, $redirects)){
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break;
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}
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$redirects[] = $newurl;
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$url = $newurl;
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}
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return $redirects;
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}
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/**
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* get_final_url()
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* Gets the address that the URL ultimately leads to.
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* Returns $url itself if it isn't a redirect.
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*
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* @param string $url
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* @return string
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*/
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function get_final_url($url){
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$redirects = $this->get_all_redirects($url);
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if (count($redirects)>0){
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return array_pop($redirects);
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} else {
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return $url;
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}
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}
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} |