CURLOPT_SSL_VERIFYHOST

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

CURLOPT_SSL_VERIFYHOST — 2 to verify that a Common Name field or a Subject Alternate Name field in the SSL peer certificate matches the provided hostname. 0 to not check the names. 1 should not be used. In production environments the value of this option should be kept at 2 (default value). Support for value 1 removed in cURL 7.28.1.

CURLOPT_SSL_VERIFYHOST = 81;