Joomla 403 Forbidden尝试访问php文件时

I have a Joomla site. I've created a subfolder with a landing page. This landing page was coded in HTML + CSS. This works perfectly but now I have added a little PHP plugin to manage MailChimp subscribers. But when I try to access to the php file, the server throws the following 403 error:

Forbidden You don't have permission to access http://www.domain.es/folder/sub-folder/server.php

I have changed the .htaccess file to allow PHP files the following way (but it doesn't work):

<FilesMatch *.php$>
 Allow from all
</FilesMatch>

Any ideas?

Try renaming server.php to myfile.php and see if you still have the same problem. It might be that your Apache server configuration has a rule to block server.php because, in many instances, files that have server.php as their name are malicious.