What potential pitfalls should be considered when putting form data and processing logic in the same PHP file?

Putting form data and processing logic in the same PHP file can lead to code duplication, decreased readability, and potential security vulnerabilities. To solve this issue, it's recommended to separate the form data handling and processing logic into different files or functions. This will improve code organization, maintainability, and security by reducing the chances of injection attacks. 

// Separate form data handling and processing logic

// form_data_handler.php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];
    // validate and sanitize form data
    // include processing logic from another file or function
}
?>

// processing_logic.php
<?php
function processFormData($username, $password) {
    // processing logic
}
?>

Keywords

security vulnerabilities injection attacks data validation separation of concerns code maintainability

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