1) Try to add - curl_exec($ch);
curl_exec($ch);
2) Save certificate file and try this.
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);curl_setopt($ch, CURLOPT_CAINFO, getcwd() . "/ca/DigiCertHighAssuranceEVRootCA.crt");