如何使用CURL PHP传递参数--cert和--key？

    $ch = curl_init("www.example.com/curl.php?option=test");
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $output = curl_exec($ch);       
    curl_close($ch);
    echo $output;
    $ch = curl_init("www.example.com/curl.php?o