How can server configurations like mod_authz_host be used to control access to PHP files?

Server configurations like mod_authz_host can be used to control access to PHP files by setting up rules in the server configuration file (.htaccess or httpd.conf) to restrict access based on IP address, domain name, or other criteria. This can help prevent unauthorized users from accessing sensitive PHP files on the server. ```apache <Files "*.php"> Require ip 192.168.1.1 </Files> ```