解析php 版获取重定向后的地址(代码)_php技巧

//取重定向的地址 <BR> class RedirectUrl{ <BR>     //地址 <BR>     var $url; <BR>     //初始化地址 <BR>     function RedirectUrl($url){ <BR>         $this->url = $url; <BR>     } <BR>     /** <BR>      * get_redirect_url() <BR>      * 取重定向的地址 <BR>      * <BR>      * @param string $url <BR>      * @return string <BR>      */ <BR>     private function get_redirect_url($url){ <BR>         $redirect_url = null; <br><br>         $url_parts = @parse_url($url); <BR>         if (!$url_parts) return f<p style="color:transparent">。本文来源gao!%daima.com搞$代*!码网1</p><cite>搞代gaodaima码</cite>alse; <BR>         if (!isset($url_parts['host'])) return false; //can't process relative URLs <BR>         if (!isset($url_parts['path'])) $url_parts['path'] = '/'; <br><br>         $sock = fsockopen($url_parts['host'], (isset($url_parts['port']) ? (int)$url_parts['port'] : 80), $errno, $errstr, 30); <BR>         if (!$sock) return false; <br><br>         $request = "HEAD " . $url_parts['path'] . (isset($url_parts['query']) ?'?'.$url_parts['query'] : '') . " HTTP/1.1\r\n"; <BR>         $request .= 'Host: ' . $url_parts['host'] . "\r\n"; <BR>         $request .= "Connection: Close\r\n\r\n"; <BR>         fwrite($sock, $request); <BR>         $response = ''; <BR>         while(!feof($sock)) $response .= fread($sock, 8192); <BR>         fclose($sock); <br><br>         if (preg_match('/^Location: (.+?)$/m', $response, $matches)){ <BR>             return trim($matches[1]); <BR>         } else { <BR>             return false; <BR>         } <BR>     } <br><br>     /** <BR>      * get_all_redirects() <BR>      * 取所有重定向地址 <BR>      * <BR>      * @param string $url <BR>      * @return array <BR>      */ <BR>     private function get_all_redirects($url){ <BR>         $redirects = array(); <BR>         while ($newurl = $this->get_redirect_url($url)){ <BR>             if (in_array($newurl, $redirects)){ <BR>                 break; <BR>             } <BR>             $redirects[] = $newurl; <BR>             $url = $newurl; <BR>         } <BR>         return $redirects; <BR>     } <br><br>     /** <BR>      * get_final_url() <BR>      * 取实际地址 <BR>      * <BR>      * @param string $url <BR>      * @return string <BR>      */ <BR>     function get_final_url(){ <BR>         $redirects = $this->get_all_redirects($this->url); <br><br>         if (count($redirects)>0){ <BR>             return array_pop($redirects); <BR>         } else { <BR>             return $this->url; <BR>         } <BR>     } <BR> } <br><br> /** <BR>  * get_show_pic <BR>  * 取最终要显示的图片地址 <BR>  * <BR>  * @param string $url <BR>  * @return  string <BR>  */ <BR> function get_show_pic($url,$noimg ='noimg.gif',$newimg="http://special.ku6img.com/projects/2010/d-color/images/slt-1.jpg"){ <BR>     $obj = new RedirectUrl($url); <br><br>     $realurl = $obj->get_final_url(); <br><br>     if(strpos($realurl,$noimg)>0){ <BR>         return $newimg; <BR>     } <BR>     return $url; <BR> } <BR> //参考 <BR> echo ""; <BR> ?> <BR>

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