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$url_in = 'http://vk.com/video_ext.php?oid=3145131&id=159485516&hash=d821df23b7dc0b54&hd=1';  
function curl($url, $cookie = false, $post = false, $header = false, $follow_location = false)  
{ 
$ch = curl_init($url); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($ch, CURLOPT_FAILONERROR, true); 
curl_setopt($ch, CURLOPT_HEADER, $header); 
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, $follow_location); 
if ($cookie) { 
    curl_setopt ($ch, CURLOPT_COOKIE, $cookie); 
} 
if ($post) { 
    curl_setopt($ch, CURLOPT_POST, 1); 
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post); 
} 
$response = curl_exec ($ch); 
curl_close($ch); 
return $response; 
} 

$vk_video = curl($url_in); 
preg_match('|host=(.*)&|Uis', $vk_video, $link1); 
preg_match('|uid=(.*)&|Uis', $vk_video, $link2); 
preg_match('|vtag=(.*)&|Uis', $vk_video, $link3); 
$link= $link1['1'].'u'.$link2['1'].'/video/'.$link3['1'].'.360.mp4';
echo $link;

问题是vtag=每个IP客户端都不同，那么我如何检索vtag客户端IP？

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