What are the potential pitfalls of combining form and business logic in the same file in PHP development?

Combining form and business logic in the same file can lead to code that is difficult to maintain, debug, and scale. It violates the principle of separation of concerns, making it harder to make changes to either the form or the business logic without affecting the other. To solve this issue, it's recommended to separate the form handling code from the business logic into different files or classes. 

// Separate the form handling code from the business logic

// Form handling code
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    // Call a function from the business logic
    $result = processFormData($name, $email);
    
    // Display result to user
    echo $result;
}

// Business logic
function processFormData($name, $email) {
    // Business logic to process form data
    return "Form data processed successfully";
}

Keywords

form handling business logic separation of concerns MVC architecture code maintainability

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