How can hidden fields be utilized in PHP forms to retain data across multiple pages?

Hidden fields can be utilized in PHP forms to retain data across multiple pages by storing the data in a hidden input field within the form. This allows the data to be passed along with the form submission and accessed on subsequent pages. By setting the value of the hidden field to the data that needs to be retained, it can be easily accessed and processed in the PHP code on each page. 

// Form page
<form method="post" action="next_page.php">
  <input type="hidden" name="hidden_field" value="data_to_retain">
  <input type="submit" value="Submit">
</form>

// Next page (next_page.php)
<?php
if(isset($_POST['hidden_field'])){
  $data = $_POST['hidden_field'];
  // Use the retained data as needed
}
?>

Keywords

hidden fields PHP forms data retention multiple pages web development

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