What are the recommended methods for passing hidden data in HTML forms using PHP for processing on the server side?

When passing hidden data in HTML forms using PHP for processing on the server side, it is recommended to use hidden input fields within the form. This allows you to send additional data along with the form submission without displaying it to the user. You can then access this hidden data on the server side using PHP's $_POST superglobal array. 

<form method="post" action="process_form.php">
  <input type="hidden" name="hidden_field" value="hidden_value">
  <!-- Other form fields here -->
  <input type="submit" value="Submit">
</form>
```

In the process_form.php file:
```php
<?php
if(isset($_POST['hidden_field'])){
  $hidden_data = $_POST['hidden_field'];
  // Process the hidden data as needed
}
?>

Keywords

hidden data HTML forms PHP server side processing methods

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