How can PHP developers optimize their code to improve readability and maintainability, especially when dealing with complex form structures?

Complex form structures in PHP can be optimized for readability and maintainability by breaking down the code into smaller, reusable functions, using proper naming conventions, and organizing the code logically. By separating the form processing logic from the presentation layer, developers can easily make changes or updates without affecting other parts of the code.

// Example of breaking down a complex form processing logic into smaller functions

function processForm($formData) {
    $validatedData = validateFormData($formData);
    if ($validatedData) {
        saveFormData($validatedData);
        displaySuccessMessage();
    } else {
        displayErrorMessage();
    }
}

function validateFormData($formData) {
    // Validation logic
    return $validatedData;
}

function saveFormData($formData) {
    // Save data to database
}

function displaySuccessMessage() {
    echo "Form submitted successfully!";
}

function displayErrorMessage() {
    echo "Form submission failed. Please check your input.";
}

// Usage
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    processForm($_POST);
}