Post data returning null [closed]

Did you try adding a value to the input field? It looks like you are using a submit input field, not a text input field. <- Never mind, it still isn’t null after submitting.

In order to troubleshoot, try adding the following to the top of your code:

<?php
echo 'Post variables:<br />';
print_r($_POST);
?>

Also, where are you placing this code? I dropped your code straight in to the header.php file of a custom theme and it worked as expected.