What are some potential pitfalls of manually tracking which posts a user has read in a PHP forum?

Potential pitfalls of manually tracking which posts a user has read in a PHP forum include the risk of data inconsistency if the tracking is not updated accurately, the potential for performance issues as the tracking data grows larger, and the possibility of security vulnerabilities if the tracking data is not properly secured.

// To address these pitfalls, consider using a database to store the read posts information and implement proper validation and sanitization techniques to prevent security vulnerabilities. Regularly clean up old or unnecessary tracking data to improve performance.