How important is it to define the purpose and functionality of a module before structuring it in PHP?

It is crucial to define the purpose and functionality of a module before structuring it in PHP to ensure that the code is organized, efficient, and easy to maintain. By clearly outlining what the module is supposed to do and how it should interact with other parts of the system, developers can create a more cohesive and effective solution.

// Example of defining the purpose and functionality of a module before structuring it in PHP

// Define the purpose of the module
// This module is responsible for fetching user data from the database

// Define the functionality of the module
function getUserData($userId) {
    // Code to fetch user data from the database
    return $userData;
}