php短域名转换为实际域名函数

<div class="codetitle"><a style="CURSOR: pointer" data="98577" class="copybut" id="copybut98577" onclick="doCopy('code98577')"> 代码如下:<div class="codebody" id="code98577">
$url = "http://sinaurl.cn/hbdsU5";
echo unshorten($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") $short = true;
if($short && startwith($head,"Location: ")) {
$location = substr($head,10);
}
}
return $location;
}
function startwith($Haystack,$Needle){
return strpos($Haystack,$Needle) === 0;
}

（编辑：李大同）

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