利用curl取得http header訊息

$remoteFile = "http://www.google.com/";  
$ch = curl_init($remoteFile); 
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); 
$data = curl_exec($ch); 
curl_close($ch);