When faced with outdated PHP code and limited knowledge, what steps can be taken to refactor and improve code quality for better performance?

Issue: When faced with outdated PHP code and limited knowledge, it can be challenging to refactor and improve code quality for better performance. One approach is to break down the code into smaller, manageable chunks and gradually update each section. Additionally, utilizing online resources, tutorials, and seeking help from experienced developers can help in understanding and implementing modern PHP practices. Code snippet:

// Original outdated PHP code
function outdatedFunction($input) {
    // outdated code logic here
    return $output;
}

// Refactored PHP code
function refactoredFunction($input) {
    // updated code logic here
    return $output;
}