php使用curl打开https网站的方法

$url = 'https://www.google.com.hk'; 
$ch = curl_init(); 
curl_setopt($ch, curlopt_url, $url); 
curl_setopt($ch, curlopt_header, false); 
curl_setopt($ch, curlopt_returntransfer, true); 
curl_setopt($ch, curlopt_ssl_verifypeer, false); 
curl_setopt($ch, curlopt_useragent, 'mozilla/5.0 (windows nt 6.1) applewebkit/537.11 (khtml, like gecko) chrome/23.0.1271.1 safari/537.11'); 
$res = curl_exec($ch); 
$rescode = curl_getinfo($ch, curlinfo_http_code);  
curl_close($ch) ; 
echo $res;