note 59395 added to migration5.incompatible

I have been developing code in PHP5, which suddenly shall run on PHP4. I used some PHP5 feature (such as "private" keyword), upon which PHP4 obviously complains. I tried a C-like idea of "define('private', '');", but it didn't work. Is there any smart way to keep the code more or less unmodified, and still running on PHP4? ---- Manual Page -- http://www.php.net/manual/en/migration5.incompatible.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+59395 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+59395&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+59395&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+59395&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+59395&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+59395&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+59395&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+59395&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+59395&report=yes Search -- http://master.php.net/manage/user-notes.php