How can hidden form fields be used to send variables via $_POST in PHP?

Hidden form fields can be used to send variables via $_POST in PHP by including them within a form that is set to submit using the POST method. These hidden fields are not visible to the user but are still submitted along with the rest of the form data. This allows for passing additional data between pages without it being displayed to the user. 

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

In the above example, a hidden input field named "hidden_variable" with a value of "value_to_send" is included within the form. When the form is submitted, this hidden field will be sent along with any other form data to the "process_form.php" script where it can be accessed using $_POST['hidden_variable'].

Keywords

hidden form fields $_POST variables PHP send

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