How can hidden fields be used to store and retrieve values in PHP forms?

Hidden fields in PHP forms can be used to store values that are not displayed to the user but can be submitted along with the form data. This can be useful for passing values between different pages or for storing information that should not be visible to the user. To use hidden fields, you can simply add an input element with the type "hidden" and set the value attribute to the desired value. When the form is submitted, the hidden field's value will be sent along with the rest of the form data. 

```php
<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, you can retrieve the value of the hidden field using `$_POST['hidden_field']`.

Keywords

hidden fields PHP forms storing values retrieving values data manipulation

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