What are the potential risks of setting directory permissions as "public permissions" for a PHP forum?

Setting directory permissions as "public permissions" for a PHP forum can expose sensitive information stored in those directories to potential attackers. This can lead to data breaches, unauthorized access to user data, and other security vulnerabilities. To solve this issue, it is important to restrict directory permissions to only allow necessary access for the PHP forum to function properly.

// Set directory permissions to restrict access
chmod("/path/to/forum/directory", 0755);