PHP - empty $_POST and $_FILES - when uploading larger files

Question

I have a following problem, I have HTML form that uploads a file with some extra information. But it allows to upload files that only less then 10MB. But when user tries to

Answer 1

i can mention that if you process form like below

if(isset($_POST['submit'])

if post_max_size is lower than posted data then the $_POST['submit'] will be empty