CURLOPT_PRE_PROXY

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

CURLOPT_PRE_PROXY — Set a string holding the host name or dotted numerical IP address to be used as the preproxy that curl connects to before it connects to the HTTP(S) proxy specified in the CURLOPT_PROXY option for the upcoming request. The preproxy can only be a SOCKS proxy and it should be prefixed with [scheme]:// to specify which kind of socks is used. A numerical IPv6 address must be written within [brackets]. Setting the preproxy to an empty string explicitly disables the use of a preproxy. To specify port number in this string, append :[port] to the end of the host name. The proxy's port number may optionally be specified with the separate option CURLOPT_PROXYPORT. Defaults to using port 1080 for proxies if a port is not specified. Available as of PHP 7.3.0 and cURL 7.52.0

CURLOPT_PRE_PROXY = 10262;