Post data returning null

Question

I'm writing code from within a plugin and I'm attempting to create a two-part registration form. I'm using POST to determine if the first part of the form was submitted or not. Unfortunately, though, the POST data is not coming through. Here is what my form looks like:

<form action="<?php echo $_SERVER['REQUEST_URI'] ?>" method="post">
<input type="submit" name="user_info_form" id="user_info_form" />
</form>

This should POST back to the same page, in theory. I then use the below code to read the POST data.

if(isset($_POST['user_info_form']))
{
echo "found data";
}
else
{
echo "nothing found";
}

Unfortunately, "nothing found" is being outputted following a form submission.

Is there any reason for this that has to do with WordPress? I've been at this for hours now so any help is very much appreciated!

Answer 1

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.

Answer 2

What about adding a hidden input field to the code?

<form action="<?php echo $_SERVER['REQUEST_URI'] ?>" method="post">
    <input type="hidden" value="1" name="form_submitted" />
    <input type="submit" name="user_info_form" id="user_info_form" />
</form>

Then compare to the hidden field's value. Does that make any difference?

Answer 3

I found my own answer on this one (just now). The stupid plugin had javascript at the bottom of the page disabling all submit buttons from working - what a joke, sorry everyone.