CURLOPT_DNS_USE_GLOBAL_CACHE

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

CURLOPT_DNS_USE_GLOBAL_CACHE — true to use a global DNS cache. This option is not thread-safe. It is conditionally enabled by default if PHP is built for non-threaded use (CLI, FCGI, Apache2-Prefork, etc.). Available as of cURL 7.9.3 and deprecated as of cURL 7.11.1.

CURLOPT_DNS_USE_GLOBAL_CACHE = 91;