PHP obtains the real address of the jump instance_PHP tutorial

There are many short URL applications now. Clicking will jump to the URL before shortening. So today we will take a look at how to get the URL before short URL jump with PHP. It is actually very simple, just use PHP. get_headers function,

get the Response Headers, and then analyze it slowly.

Give specific implementation methods:

if (is_array($header['Location'])) { return $header['Location'][count($header['Location'])-1];

The code is as follows

代码如下	复制代码
$header = get_headers($url, 1); if (strpos($header[0], ’301′) || strpos($header[0], ’302′)) { if (is_array($header['Location'])) { return $header['Location'][count($header['Location'])-1]; } else { return $header['Location']; } } else { return $url; }

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$header = get_headers($url, 1);

代码如下

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// echo get_redirect_url('http://www.111cN.nEt'); //输出结果为：http://code.google.com/android/ 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/1.1rn";     $request .= 'Host: ' . $url_parts['host'] . "rn";     $request .= "Connection: Closernrn";     fwrite($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;     } }

if (strpos($header[0], ’301′) || strpos($header[0], ’302′)) ​​{

} else { return $header['Location'];

}

} else { return $url; } Example 2

The code is as follows

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//The output result is: http://code.google.com/android/ 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 rn"; $request .= 'Host: ' . $url_parts['host'] . "rn"; $request .= "Connection: Closernrn"; fwrite($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; } } http://www.bkjia.com/PHPjc/631515.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631515.htmlTechArticleThere are many short URL applications. Clicking will jump to the URL before shortening, so today we will do it Let’s take a look at how PHP gets the URL before the short URL jump. It’s actually very simple...