解析php 版获取重定向后的地址(代码)

2024-05-04 22:25:06

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代码如下:
//取重定向的地址
class RedirectUrl{
     //地址
     var $url;
     //初始化地址
     function RedirectUrl($url){
         $this->url = $url;
     }
     /**
      * get_redirect_url()
      * 取重定向的地址
      *
      * @param string $url
      * @return string
      */
     private function get_redirect_url($url){
         $redirect_url = null;

         $url_parts = @parse_url($url);
         if (!$url_parts) return false;
         if (!isset($url_parts['host'])) return false; //can't process relative URLs
         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";
         $request .= "Connection: Close/r/n/r/n";
         fwrite($sock, $request);
         $response = '';
         while(!feof($sock)) $response .= fread($sock, 8192);
         fclose($sock);

         if (preg_match('/^Location: (.+?)$/m', $response, $matches)){
             return trim($matches[1]);
         } else {
             return false;
         }
     }

     /**
      * get_all_redirects()
      * 取所有重定向地址
      *
      * @param string $url
      * @return array
      */
     private function get_all_redirects($url){
         $redirects = array();

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