CURLOPT_SOCKS5_AUTH

CURLOPT_SOCKS5_AUTH is one of the accepted parameters for curl_setopt parameter #2.

CURLOPT_SOCKS5_AUTH — The SOCKS5 authentication method(s) to use. The options are: CURLAUTH_BASIC, CURLAUTH_GSSAPI, CURLAUTH_NONE. The bitwise | (or) operator can be used to combine more than one method. If this is done, cURL will poll the server to see what methods it supports and pick the best one. CURLAUTH_BASIC allows username/password authentication. CURLAUTH_GSSAPI allows GSS-API authentication. CURLAUTH_NONE allows no authentication. Defaults to CURLAUTH_BASIC|CURLAUTH_GSSAPI. Set the actual username and password with the CURLOPT_PROXYUSERPWD option. Available as of PHP 7.3.0 and cURL 7.55.0

CURLOPT_SOCKS5_AUTH = 267;