PHP obtains the real address of the jump instance_PHP tutorial-PHP Tutorial-php.cn

PHP obtains the real address of the jump instance_PHP tutorial

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Release： 2016-07-13 16:57:40

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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; }

Copy code

$header = get_headers($url, 1);

代码如下

复制代码

//
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'];

}