How can refactoring spaghetti code improve the readability and maintainability of PHP scripts?

Spaghetti code refers to poorly structured code that is difficult to read, understand, and maintain. Refactoring spaghetti code involves restructuring the code into smaller, more manageable components, improving its readability and maintainability. This can be achieved by breaking down large functions into smaller, more focused functions, removing duplicate code, and organizing code into logical sections.

// Original spaghetti code
function processData($data) {
    // long and convoluted code here
}

// Refactored code
function processData($data) {
    $cleanData = cleanData($data);
    $validatedData = validateData($cleanData);
    $processedData = processValidData($validatedData);

    return $processedData;
}

function cleanData($data) {
    // code to clean data
}

function validateData($data) {
    // code to validate data
}

function processValidData($data) {
    // code to process valid data
}