What are the best practices for setting server permissions for PHP forums, especially when it comes to directories like cache, files, and store that require write access?

When setting server permissions for PHP forums, it is important to ensure that directories requiring write access, such as cache, files, and store, are properly configured to prevent security vulnerabilities. One common best practice is to set the directory permissions to allow the web server user (usually www-data or apache) to write to these directories, while restricting write access to other users. This can help prevent unauthorized users from modifying critical files or injecting malicious code. 

// Set directory permissions for cache, files, and store directories
chmod('cache', 0755); // Allow web server user to write
chmod('files', 0755); // Allow web server user to write
chmod('store', 0755); // Allow web server user to write

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