What are the potential pitfalls of trying to integrate PHP code into an .htm file?

Potential pitfalls of integrating PHP code into an .htm file include the file not being parsed by the server as PHP, resulting in the code being displayed as plain text in the browser. To solve this issue, you can either rename the file extension to .php or configure your server to treat .htm files as PHP files.

AddType application/x-httpd-php .htm