note 103383 added to language.oop5.decon

Php 5.3.3 had a very strange bug, related to __destruct, but this bug was fixed in 5.3.6. This bug happened to me and it took me forever to figure it out, so I wanted to share it. In short, don't unset properties in __destruct(): <?php class Foobar { public $baz; function __destruct() { # Don't do either of these, if $baz also has a __destruct()! $this->baz = null; unset($this->baz); # Instead, don't clear it at all, or do this: $this->baz->__destruct(); } } ?> If you made this mistake, this might happen in php<5.3.6: <?php # Some function that throws an exception function fail($foobar) { throw new Exception("Exception A!"); } $foobar = new Foobar(); $foobar->baz = new Foobar(); try { fail($foobar); // Send foobar to func that throws an Exception } catch( Exception $e ) { print $e->getMessage(); // Exception A will be caught and printed, as expected. } $foobar = null; // clearing foobar, and its property $baz try { print 'Exception B:';// this will be printed // output stops here. throw new Exception("Exception B!"); } catch( Exception $e ) { print $e->getMessage(); // doesn't happen } print 'End'; // this won't be printed ?> ---- Server IP: 69.147.83.197 Probable Submitter: 192.87.139.139 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.decon.php Edit -- https://master.php.net/note/edit/103383 Del: integrated -- https://master.php.net/note/delete/103383/integrated Del: useless -- https://master.php.net/note/delete/103383/useless Del: bad code -- https://master.php.net/note/delete/103383/bad+code Del: spam -- https://master.php.net/note/delete/103383/spam Del: non-english -- https://master.php.net/note/delete/103383/non-english Del: in docs -- https://master.php.net/note/delete/103383/in+docs Del: other reasons-- https://master.php.net/note/delete/103383 Reject -- https://master.php.net/note/reject/103383 Search -- https://master.php.net/manage/user-notes.php