Why would $_FILES be empty when uploading files to PHP?

Question

I have WampServer 2 installed on my Windows 7 computer. I\'m using Apache 2.2.11 and PHP 5.2.11. When I attempt to upload any file from a form, it seems to upload, but in PH

Answer 1

Here another cause I found: When using JQuery Mobile and the form attribute data-ajax is set to true, the FILES array will be empty. So set data-ajax to false.