What are some best practices for handling form submissions in PHP to avoid duplicate orders or submissions?

To avoid duplicate orders or submissions in PHP when handling form submissions, you can implement a token-based system. Generate a unique token for each form submission and store it in a session or database. Check if the token has already been used before processing the form data to prevent duplicate submissions. 

session_start();

// Generate a unique token for the form submission
$token = md5(uniqid(rand(), true));

// Store the token in the session
$_SESSION['form_token'] = $token;

// Check if the token has already been used
if(isset($_SESSION['form_token']) && $_POST['form_token'] === $_SESSION['form_token']){
    // Process the form data
    // Your code here
    // Clear the token to prevent duplicate submissions
    unset($_SESSION['form_token']);
}

Keywords

SQL injection CSRF protection form validation unique constraints transaction handling

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