CURLOPT_PINNEDPUBLICKEY

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

CURLOPT_PINNEDPUBLICKEY — Set a string with the pinned public key. The string can be the file name of the pinned public key in a PEM or DER file format. The string can also be any number of base64 encoded sha256 hashes preceded by sha256// and separated by ;. Available as of PHP 7.0.7 and cURL 7.39.0.

CURLOPT_PINNEDPUBLICKEY = 10230;