What role does the Apache server play in password protection for included files in PHP?

The Apache server can play a role in password protection for included files in PHP by using htaccess files to restrict access to certain directories or files. This can help prevent unauthorized users from accessing sensitive information or code within included files.

```php
// Create a .htaccess file in the directory containing the included files
// Add the following code to the .htaccess file to password protect the directory
AuthType Basic
AuthName "Restricted Area"
AuthUserFile /path/to/.htpasswd
Require valid-user
```

Note: Make sure to create a .htpasswd file containing the usernames and passwords for authorized users.