在php中使用curl庫訪問https，具體方法如下：

function curlPost($url, $data = array(), $timeout = 30, $CA = true){ 
$cacert = getcwd() . '/cacert.pem'; //CA根證書 
$SSL = substr($url, 0, 8) == "https://" ? true : false; 
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_URL, $url); 
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout); 
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout-2); 
if ($SSL && $CA) { 
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true); // 只信任CA頒布的證書 
curl_setopt($ch, CURLOPT_CAINFO, $cacert); // CA根證書（用來驗證的網站證書是否是CA頒布） 
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); // 檢查證書中是否設置域名，并且是否與提供的主機名匹配 
} else if ($SSL && !$CA) { 
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // 信任任何證書 
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 1); // 檢查證書中是否設置域名 
} 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:')); //避免data數據過長問題 
curl_setopt($ch, CURLOPT_POST, true); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $data); 
//curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data)); //data with URLEncode 
$ret = curl_exec($ch); 
//var_dump(curl_error($ch)); //查看報錯信息 
curl_close($ch); 
return $ret; 
}