The address may be any valid IPv4 or IPv6 address. The "0.0.0.0" indicates
"all IPv4 interfaces" and is appropriate for most users. Use "::" to indicate "all IPv6
interfaces". To indicate "all IPv4 *and* IPv6 interfaces", use a "*" wildcard character.
Note that "::" may also listen on some systems on IPv4 interfaces. PHP currently does
not expose the IPV6_V6ONLY constant.
Any valid port number [1-65535] may be used. Port numbers lower than 256 are reserved for
well-known services (like HTTP on port 80) and port numbers less than 1024 require root
access on UNIX-like systems. The default port for encrypted sockets (https) is 443. If you
plan to use encryption with this host you'll generally want to use port 443.