CURLOPT_ISSUERCERT

CURLOPT_ISSUERCERT is one of the accepted parameters for curl_setopt parameter #2.

CURLOPT_ISSUERCERT — If set to a string naming a file holding a CA certificate in PEM format, an additional check against the peer certificate is performed to verify the issuer is indeed the one associated with the certificate provided by the option. For the result of the check to be considered a failure, this option should be used in combination with the CURLOPT_SSL_VERIFYPEER option. Available as of cURL 7.19.0.

CURLOPT_ISSUERCERT = 10170;