validate empty file upload

Hi all, i have written the following code to check empty file upload in server-side validation for form field "file_0" which is an "Upload file" field:

<?php
global $mainframe;
if(JRequest::getVar('file_0')=="")
return "File upload field is required.";
?>

...but above code not working, i have also replaced if statement with JRequest::getVar('file_0')==NOFILE but it's not working also.

How can i do this?

at last, i nailed it down myself....the php $_Files variable will do the trick...thanx anywayz..z

ahmedsheeraz,

Please explain what your solution was for the "upload required" validation.

Thanks in advance!

this should do it:

$myfile = JRequest::getVar( 'file_field_name', array(), 'files', 'array' );//add field name here
if(!$myfile['name'])
return 'you must upload some file!';

Max