代码如下:
/** * get_redirect_url() * gets the address that the provided url redirects to, * or false if there’s no redirect. * * @param string $url * @return string */function get_redirect_url($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, $matches)){ if ( substr($matches[1], 0, 1) == “/” ) return $url_parts[‘scheme’] . “://” . $url_parts[‘host’] . trim($matches[1]); else return trim($matches[1]); } else { return false; }}/** * get_all_redirects() * follows and collects all redirects, in order, for the given url. * * @param string $url * @return array */function get_all_redirects($url){ $redirects = array(); while ($newurl = get_redirect_url($url)){ if (in_array($newurl, $redirects)){ break; } $redirects[] = $newurl; $url = $newurl; } return $redirects;}
php实现用socket获取301跳转地址，可以提取跳转过程中的url
http://www.bkjia.com/phpjc/621688.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/621688.htmltecharticle 代码如下: /** * get_redirect_url() * gets the address that the provided url redirects to, * or false if there’s no redirect. * * @param string $url * @return strin…