Re: reference counting and garbage collection

Yes, I've had php3 scripts that spiral linux into the ground and or core dump because of not being able to allocate memory (because it doesn't free it correctly). I would unset every variable I ever used, and it would still blow up. PHP4 rocks! I have none of these issues with PHP4, even without using unset. -jeremy brand _______________________________________________________________________ GnuPG Fingerprint: 9F5E 95E0 1CC2 E054 84EA 6099 8ACD 9DBA D2C0 5EA9 _ http://www.JeremyBrand.com/Jeremy/Brand/Jeremy_Brand.html for more __ On Fri, 3 Nov 2000, Michael Kimsal wrote: > Date: Fri, 03 Nov 2000 16:13:11 -0500 > From: Michael Kimsal <michael@tapinternet.com> > To: Dean Hall <hall@apt7.com> > Cc: php-general@lists.php.net > Subject: Re: [PHP] reference counting and garbage collection > > I'm pretty sure this person doesn't quite know what they're talking about. > http://www.zend.com/zend/art/ref-count.php is an article > by Zeev that has a lot of info on reference counting. There are a couple > issues they mention with respect to being careful with code, > but I've never seen anything regarding this. In fact, PHP4 in particular > has been, in my experience, the only platform I've never had any garbage > collection > issues with at all, and I don't unset() things all that much. > > > Dean Hall wrote: > > > I read something today from someone else's source that made me think. He > > said that since PHP uses reference counters, you need to 'unset' all your > > references before you exit your script. In particular, he was talking about > > an n-ary tree data structure he had made. He insisted in his comments that > > before the script ends, you call his cleanup method that goes through the > > entire tree and 'unset's all the references to parents and children. > > > > I'm worried about this, because I wrote an n-ary tree data structure as a > > navigation hierarchy for my website > > <http://www.apt7.com/src/NavNode.txt>. > > It uses references to keep track of its parent and its children. Do I need > > to unset these before script execution ends? Will I end up with memory > > leaks? I'm not familiar enough with the innards of PHP to know. > > > > Thanks to any brave enough to tackle this. > > Dean. > > -- > ========================== > Michael Kimsal > http://www.tapinternet.com > 734-480-9961 > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net > >