How can hidden form fields be utilized in PHP to retain transferred data for processing and submission?

Hidden form fields can be utilized in PHP to retain transferred data by including them in the HTML form with the "hidden" input type. This allows data to be passed along with the form submission without being visible to the user. In PHP, you can access the hidden field values using the $_POST or $_GET superglobals just like any other form field. 

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

<?php
// process.php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $hidden_value = $_POST['hidden_field'];
  // process the hidden value as needed
}
?>

Keywords

hidden form fields PHP data retention processing submission

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