This code returns an array of localhost, 127.0.0.1, ::1, and '[::1]'.
/**
* @return array
*/
function getLocalHostnames()
{
return ['localhost', '127.0.0.1', '::1', '[::1]', '[::]', '0000::1', '0177.0.0.1', '2130706433', '[0:0:0:0:0:ffff:127.0.0.1]'];
}