What are the best practices for structuring PHP code to improve readability and maintainability, especially when dealing with complex logic?

When dealing with complex logic in PHP code, it is important to follow best practices to improve readability and maintainability. One way to achieve this is by breaking down the logic into smaller, more manageable functions or classes. This helps in organizing the code and making it easier to understand. Additionally, using meaningful variable names, comments, and proper indentation can also greatly enhance the readability of the code.

// Example of structuring PHP code for improved readability and maintainability

// Define a function to handle complex logic
function complexLogic($input) {
    // Break down the logic into smaller, more manageable steps
    $step1 = doStep1($input);
    $step2 = doStep2($step1);
    $result = doFinalStep($step2);

    return $result;
}

// Define helper functions for each step of the logic
function doStep1($input) {
    // Implementation of step 1
}

function doStep2($input) {
    // Implementation of step 2
}

function doFinalStep($input) {
    // Implementation of the final step
}