In what ways can PHP developers optimize existing code to incorporate additional functionality like code generation without starting from scratch?

To optimize existing PHP code to incorporate additional functionality like code generation without starting from scratch, developers can refactor the code to make it more modular and reusable. This involves breaking down the existing code into smaller, more manageable components and identifying common patterns that can be abstracted into functions or classes. By doing so, developers can easily add new features like code generation without disrupting the existing codebase.

// Example of refactoring existing code to incorporate code generation functionality

// Existing code
function processData($data) {
    // Existing code logic
}

// Refactored code with code generation functionality
function processData($data) {
    // Existing code logic
    generateCode($data);
}

function generateCode($data) {
    // Code generation logic
}