Returns the time the file was last accessed, or FALSE in case of an error. The
time is returned as a Unix timestamp.
The results of this function are cached. See
clearstatcache() for more details.
Note: The atime of a file is supposed to change whenever
the data blocks of a file are being read. This can be costly
performancewise when an application regularly accesses a very
large number of files or directories. Some Unix filesystems
can be mounted with atime updates disabled to increase the
performance of such applications; USENET news spools are a
common example. On such filesystems this function will be
useless.
This function will not work on remote files; the file to be
examined must be accessible via the server's filesystem.