How can you securely pass a primary key value in a PHP form without allowing it to be edited?

When passing a primary key value in a PHP form, you can securely store the key in a session variable on the server side and pass it as a hidden input field in the form. This way, the key is not visible or editable by the user. When the form is submitted, you can retrieve the key from the session variable to ensure its integrity. 

<?php
session_start();

// Set the primary key value in a session variable
$_SESSION['primary_key'] = $primary_key_value;

// In the form, pass the primary key as a hidden input field
<input type="hidden" name="primary_key" value="<?php echo $_SESSION['primary_key']; ?>">

// When processing the form submission, retrieve the primary key value
$primary_key = $_SESSION['primary_key'];

// Perform necessary actions with the primary key value
?>

Keywords

PHP form security hidden field encryption

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