How can PHP developers prevent users from manipulating form data to change prices before submission?

To prevent users from manipulating form data to change prices before submission, PHP developers can use server-side validation to verify the submitted data against the original prices stored in the database. This way, any discrepancies can be detected and flagged for further review before processing the transaction. 

// Assuming $originalPrice is the original price fetched from the database
$submittedPrice = $_POST['price'];

if ($submittedPrice != $originalPrice) {
    // Price manipulation detected, handle accordingly
    die('Price manipulation detected');
} else {
    // Proceed with processing the transaction
}

Keywords

PHP form validation input sanitization data validation security measures

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