What steps can be taken to configure a Linux server to only listen on IPv6 in PHP?

To configure a Linux server to only listen on IPv6 in PHP, you can modify the PHP configuration file to specify the IPv6 address to listen on. This can be done by setting the "listen" directive in the PHP configuration file to the IPv6 address of the server.

// Set the IPv6 address to listen on in the PHP configuration file
$cfg['Server']['host'] = '[::1]';