How to check if the file input field is empty?

Question

I am having a hard time using $_FILES

I want to check if file upload field is empty or not then apply a condition such that if file upload is empty then the script doesn't try uploading the file. How do I enforce this?

Answer 1

if($_FILES["file"]["error"] != 0) { //stands for any kind of errors happen during the uploading }  

also there is

if($_FILES["file"]["error"] == 4) { //means there is no file uploaded } 

Answer 2

This should work

if ( ! empty($_FILES)) {...}