php curl获取301或302转向的网址问题的解决方法

<? 
$ghurl = isset($_GET['id']) ? $_GET['id']:'http://www.baidu.com/'; 
// php 获取 
function getContents($url){ 
$header = array("Referer: http://www.baidu.com/"); 
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $url); 
curl_setopt($ch, CURLOPT_TIMEOUT, 30); 
curl_setopt($ch, CURLOPT_HTTPHEADER,$header); 
curl_setopt($ch, CURLOPT_FOLLOWLOCATION,1); //是否抓取跳转后的页面 
ob_start(); 
curl_exec($ch); 
$contents = ob_get_contents(); 
ob_end_clean(); 
curl_close($ch); 

return $contents; 
} 

$contents = getContents($ghurl); 
echo $contents; 
?>