What are the best practices for handling multiple form submissions in PHP?

When handling multiple form submissions in PHP, it is important to prevent duplicate submissions by implementing techniques such as using a unique token or disabling the submit button after the form is submitted. This helps to avoid processing the same form data multiple times and ensures data integrity. 

// Example of using a unique token to prevent duplicate form submissions

session_start();

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    if (!empty($_POST['token']) && $_POST['token'] == $_SESSION['token']) {
        // Process form data
        // Reset token to prevent resubmission
        $_SESSION['token'] = uniqid();
    } else {
        // Handle duplicate form submission
        echo "Form already submitted.";
    }
}

// Generate unique token
$_SESSION['token'] = uniqid();

Keywords

form submissions PHP validation CSRF protection session management

Related Questions