PHP Selector in CloudLinux does not have a built-in option to allow users to manage the disable_functions directive. This directive is typically controlled at the server level by the system administrator or hosting provider for security reasons.

However, if you have a specific use case where you want to allow users to customize the disable_functions directive, you might need to implement a custom solution. Keep in mind that granting users control over this directive can potentially introduce security risks.

Here is a general outline of how you might approach this:

1. Develop a Custom Interface:

   • You would need to create a custom interface or control panel where users can select the functions they want to disable. This could be a web-based interface or a custom script.

2. Validate User Input:

   • Implement validation checks to ensure that users can only disable functions that are safe to disable. Providing an unchecked list of functions may lead to security vulnerabilities.

3. Modify PHP Configuration:

   • Use PHP's configuration management functions to dynamically modify the disable_functions directive based on the user's selections.

4. Restart PHP:

   • After making changes to the disable_functions directive, you would need to restart the PHP service for the changes to take effect.

5. Handle Error Scenarios:

   • Implement error handling to deal with scenarios where a user might inadvertently disable a critical function, leading to issues with their applications.

6. Security Considerations:

   • Be extremely cautious about allowing users to modify PHP configuration, as it can have significant security implications. Make sure you have robust authentication and authorization mechanisms in place.

7. Logging and Auditing:

   • Keep detailed logs of any changes made to the disable_functions directive. This can be crucial for troubleshooting and auditing purposes.

8. Regular Security Audits:

   • Regularly audit the changes made by users to ensure they are not introducing vulnerabilities or breaking functionality inadvertently.

Remember, implementing such a feature requires a deep understanding of PHP, server security, and system administration. If you're not experienced in these areas, it's recommended to consult with a qualified system administrator or developer. Additionally, always have proper backups and testing procedures in place before implementing any changes that could impact server security or stability.