I created a page that contains list of checkboxes in a loop like,

<input type=checkbox name='CHK[]' value=LoopValue>


I am posting this page to an another PHP page
where I have written
$chk = $_POST['CHK'];
print_r($chk);

and as a reasult it is showing me nothing.. while I have selected some checkboxes as well.
Same problem with <input type=file name=file>

This is all working in PHP 4 while it is not working in PHP 5.2.6.