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.
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