php $_POST array empty upon form submission

I have a custom Content Management System (CMS) I've built that works perfectly on my dev box (Ubuntu/PHP5+/MySQL5+).

I just moved it up to the production box for my client and now all form submissions are showing up as empty $_POST arrays.

I found a trick to verify the data is actually being passed using file_get_contents('php://input'); and the data is showing up fine there -- the $_POST/$_REQUEST arrays are always empty.

I've also verified the content-type headers are correct as well via firebug (application/x-www-form-urlencoded; charset=utf-8).

This issue is happening regardless of whether a form is submitting via AJAX or a regular form submit.

Any help is greatly appreciated!

Solution 1:

When using JSON content-type the $_POST array will not populate (only with multi-part forms I believe)

Here is how I correct the issue:

$_POST = json_decode(file_get_contents("php://input"), true);

Solution 2:

Here's another possible cause -- my form was submitting to domain.com without the WWW. and I had set up an automatic redirect to add the "WWW." The $_POST array was getting emptied in the process. So to fix it all I had to do was submit to www.domain.com