Best way to determine if a file is empty (php)?

Question

I\'m including a custom.css file in my template to allow site owners to add their own css rules. However, when I ship the file, its empty and there\'s no sense loading it if

Answer 1

Using filesize() is clearly better. It uses stat() which doesn't have to open the file at all.

file_get_contents() reads the whole file.. imagine what happens if you have a 10GB file.