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

Everybody be carefull when using filesize, cause it's results are cached for better performance. So if you need better precision, it is recommended to use something like:

More info here