CURLOPT_SSLVERSION

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

CURLOPT_SSLVERSION — One of

 .
 The maximum TLS version can be set by using one of the
 `CURL_SSLVERSION_MAX_*`
 constants.
 It is also possible to bitwise OR one of the
 `CURL_SSLVERSION_*`
 constants with one of the
 `CURL_SSLVERSION_MAX_*`.

 .

CURLOPT_SSLVERSION = 32;