Php根据短地址转换为源地址

php

$url = "http://dwz.im/14p";

echo unshorten ( $url );

function unshorten($url) {

 $url = trim ( $url );

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 $headers = get_headers ( $url );

 $location = $url;

 $short = false;

 foreach ( $headers as $head ) {

  if ($head == "HTTP/1.1 302 Found" || $head == 'HTTP/1.0 301 Moved Permanently')

   $short = true;

  if ($short && startwith ( $head, "Location: " )) {

   $location = substr ( $head, 10 );//Location:  10个字符

  }

 }

 return $location;

}

function startwith($Haystack, $Needle) {

 return strpos ( $Haystack, $Needle ) === 0;

}

/* Array

(

  [0] => HTTP/1.0 301 Moved Permanently

  [1] => Date: Mon, 04 Feb 2013 06:46:04 GMT

  [2] => Server: LiteSpeed

  [3] => Connection: close

  [4] => X-Powered-By: PHP/5.3.20

  [5] => Location: http://yxmhero1989.blog.163.com

  [6] => Content-Type: text/html

  [7] => Content-Length: 0

  [8] => Vary: User-Agent

  [9] => HTTP/1.1 200 OK

  [10] => Server: nginx

  [11] => Date: Mon, 04 Feb 2013 06:46:05 GMT

  [12] => Content-Type: text/html;charset=GBK

  [13] => Connection: close

  [14] => Vary: Accept-Encoding

  [15] => Vary: Host,Accept-Encoding

  [16] => Set-Cookie: USERTRACK=61.170.229.53.1359960365378463; path=/; expires=Fri, 05-Apr-13 06:46:05 GMT; domain=.163.com

  [17] => Set-Cookie: NTESBLOGSI=B9DAF1AA5E615128B7B79DCCF95AB455.app-71-8010; Domain=.blog.163.com; Path=/

  [18] => Cache-Control: must-revalidate

  [19] => Expires: Mon, 25 Apr 2005 21:10:50 GMT

  [20] => Last-Modified: Mon, 04 Feb 2013 06:46:05 GMT

  ) */

?>