Stut schreef: > On 21 Oct 2008, at 22:08, Jochem Maas wrote: >> Mike van Riel schreef: >>> Dan Joseph wrote: >>>> Hi, >>>> >>>> I want to make sure I completely understand __destruct() and when its >>>> hit... >>>> >>>> Understand that it will run if all references to a particular object >>>> are >>>> removed, but is that also true when a page ends its execution? >>>> >>>> Example, I call a database class. It constructs, connects, then my >>>> page >>>> pulls some stuff out of the database, and then the php script ends. >>>> Does >>>> this also cause the deconstruct to execute? >>>> >>> >>> When a script ends everything is released (with some small exceptions), >>> thus also all references to instances of classes. >>> Thus AFAIK a deconstructor will always be called at the end of script >>> execution. >>> >> >> but you have no control over what order dtors are called and you can't >> make >> any assumptions about state of file handles to STDIN/STDOUT and things >> like >> that ... personally I find dtors run at end of script to be nigh on >> useless. > > I use destructors to update dirty objects in memcache. care to eloborate ... sounds interesting. I also use them > in my template class to optionally automagically output the footer > without needing an explicit call on each page. not sure if I find that of much use, I see the validity but 1 LOC to eplicitly output a page footer seems to me to be less of a wtf than an(other) bit of auto-magic to save what is probably a very short simple method call. > They're far from useless. true. but they are limited, there is no garantee any other object will still exist when a particular dtor is run [at shutdown] which means a heavy OO codebase cannot have object automated object interaction at shutdown ... there are other gotchas (e.g. closed file descriptors to STDIN/STDOUT) interaction with memcache though is a really good example. and I'd like to learn a little more :-D > -Stut > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
