How can PHP be used to track the URL from which a form was submitted?

To track the URL from which a form was submitted in PHP, you can use the $_SERVER['HTTP_REFERER'] variable. This variable contains the URL of the page that referred the user to the current page. You can store this value in a hidden input field in the form and then retrieve it when the form is submitted. 

```php
<form action="process_form.php" method="post">
    <input type="hidden" name="referer" value="<?php echo $_SERVER['HTTP_REFERER']; ?>">
    <!-- other form fields here -->
    <button type="submit">Submit</button>
</form>
```

In the process_form.php file, you can access the referer URL by using $_POST['referer'].

Keywords

PHP form submission tracking URL referrer

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