How can PHP code be executed in files with a .htm extension?

To execute PHP code in files with a .htm extension, you can configure your web server to treat .htm files as PHP files. This can be done by adding a directive in the server configuration file to interpret .htm files as PHP scripts. Once this is set up, you can include PHP code within your .htm files, and it will be executed properly. ```apache <FilesMatch "\.(htm|html)$"> SetHandler application/x-httpd-php </FilesMatch> ```