What are some common pitfalls to avoid when handling form data and $_POST in PHP within an MVC architecture?

One common pitfall is not properly sanitizing and validating form data before using it in the application. This can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To avoid this, always sanitize and validate form data before processing it. 

// Example of sanitizing and validating form data in PHP within an MVC architecture
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
    $password = filter_input(INPUT_POST, 'password', FILTER_SANITIZE_STRING);

    // Validate form data
    if (empty($username) || empty($password)) {
        // Handle validation errors
    } else {
        // Process the form data
    }
}

Keywords

$_POST form data MVC architecture validation security

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