PHP-php短网址的恢复

Question

先前看到有人问正常网址转换为短网址，
现在想请教各位能把转换后的短网址再还原回来呢...

Answer 1

这是微博一个短网址还原的程序，建议你参考一下：

function shorurl($url)
{
$url = trim($url);
$headers = get_headers($url);
$location = $url;
$short = false;
foreach($headers as $head)
{
if($head=="HTTP/1.1 302 Found")
$short = true;
if($short && purl($head,"Location: "))
{
$location = substr($head,10);
}
}
return $location;
}
function purl($Haystack, $Needle)
{
return strpos($Haystack, $Needle) === 0;
}

Answer 2

function get_real_url($url){
$headers = @get_headers($url);
$pattern = '/Locations*:s*(https?:[^;snr]+)/i';
if($locations = preg_grep($pattern, $headers)){
preg_match($pattern, end($locations), $redirect);
return $redirect[1];
}
return $url;
}

参考：PHP 还原短网址方法和源码