How to user curl_setopt?

Hello, Now I need to use curl to connect to a secure website, I have three certificates files, two .cer files and one .pfx file. After I import the certificates into IE browser, the visit is OK. However, when I use curl_setopt to configure the certificates, it failed. Can anybody help me? Thanks. The code is below: <? $ch = curl_init(); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0); curl_setopt($ch, CURLOPT_SSLCERT,'G:\test\ssl\mes1.cer'); curl_setopt($ch, CURLOPT_SSLCERT,'G:\test\ssl\mes2.cer'); curl_setopt($ch, CURLOPT_SSLKEY, 'G:\test\ssl\xxxx.pfx'); curl_setopt($ch, CURLOPT_SSLKEYPASSWD,'password'); curl_setopt($ch, CURLOPT_URL, $host.$uri); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch,CURLOPT_HEADER,1); curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); $returned = curl_exec($ch); echo $returned; ?> lhb