Php根据短地址转换为源地址

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

echo unshorten ( $url );

function unshorten($url) {

$url = trim ( $url );

$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

) */

?>