What are common reasons for PHP code not being executed properly in a protected directory with a .htaccess file?

Common reasons for PHP code not being executed properly in a protected directory with a .htaccess file include incorrect configuration of the .htaccess file, misconfigured server settings, or PHP errors that are not being displayed. To solve this issue, ensure that the .htaccess file allows PHP execution, check server settings for any restrictions on PHP execution, and enable error reporting in PHP to troubleshoot any potential errors.

<FilesMatch "\.php$">
    SetHandler application/x-httpd-php
</FilesMatch>