note 52779 added to function.gethostbyaddr

Hi guys, is there any way to log mac id of a system using PHP, as I want to know whether the same visitor is coming back again or not. Or is there any other way to move around this? Logging IP alone will solve my requirement as there are dynamic IP addresses. So for the same visitor, the IP may be different some other time. ---- Manual Page -- http://www.php.net/manual/en/function.gethostbyaddr.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+52779 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+52779&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+52779&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+52779&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+52779&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+52779&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+52779&report=yes Search -- http://master.php.net/manage/user-notes.php