Returns the time of the last modification of the current
page. The value returned is a Unix timestamp, suitable for
feeding to
date(). Returns
FALSE on error.
注: If you're interested in getting the last modification time of a different file, consider using filemtime().
See also date(),
getmyuid(),
getmygid(),
get_current_user(),
getmyinode(), getmypid(), and
filemtime().