PHP Problem : filesize() return 0 with file containing few data?

Question

I use PHP to call a Java command then forward its result into a file called result.txt. For ex, the file contains this: \"Result is : 5.0\" but the function filesize() retur

Answer 1

Which function do you use ?
Because exec() can directly assign result to a variable, so maybe there's no need to save output to a file, if you just want to load it in PHP.