How can hidden fields be used to pass variables between PHP files?

Hidden fields can be used in HTML forms to pass variables between PHP files. When a form is submitted, the hidden field values are sent along with the rest of the form data. In the receiving PHP file, these hidden field values can be accessed using the $_POST or $_GET superglobals, depending on the form submission method. 

// Sending PHP file
<form action="receiver.php" method="post">
    <input type="hidden" name="variable_name" value="variable_value">
    <input type="submit" value="Submit">
</form>

// Receiving PHP file (receiver.php)
<?php
$passed_variable = $_POST['variable_name'];
echo $passed_variable;
?>

Keywords

hidden fields variables PHP files passing data form submission

Related Questions