PHP Manual: fstat
fstat
Description
array fstat ( resource handle )
Gathers the statistics of the file opened by the file
pointer handle. This function is similar to the
stat() function except that it operates
on an open file pointer instead of a filename.
Returns an array with the statistics of the file; the format of the array is described in detail on the stat() manual page.
Note: This function will not work on remote files as the file to be examined must be accessible via the servers filesystem.