Re: PHP 4.0 Bug #7646: Objects inside session variables get lost

martijnklingens@netscape.net wrote: > From: martijnklingens@netscape.net > Operating system: Linux 2.2 / Apache 1.3 > PHP version: 4.0.3pl1 > PHP Bug Type: Scripting Engine problem > Bug description: Objects inside session variables get lost > > Hi, > > I encountered a strange bug in PHP when a session variable (an object in my case) holds > instances of other classes. As soon as I call a method on such an embedded instance, the instance is > lost the next time a page is loaded. > > I guess the garbage collector is a little bit too good and cleans up objects that are still in > use, but I'm not completely sure about that. > > _READING_ a variable (as opposed to calling methods) does not trigger the bug, so a workaround > is copying the object and calling the method on the copy, but I guess it should be fixed > nevertheless. > > Below is a script that reliably reproduces the bug on my system. It's rather large, but > with all the echo statements it should be immediately clear what it does. If you still have > questions about the script or about my configuration, feel free to drop me an email at > martijnklingens@netscape.net > > Thanks in advance for your help, > > Martijn Klingens > > Script Below ------> > <?PHP > > // Class A is the session var that holds instances of class B > class A > { > var $Items = array (); > > function A () > { > $this->Items [] = new B ("B1"); > $this->Items [] = new B ("B2"); > } > } > > class B > { > var $Value; > > function B ($Value) > { > $this->Value = $Value; > } > > function SomeFunction () > { > // Just do nothing, calling the method is enough to trigger the bug > } > } > > session_register ("MyA"); > session_register ("Count"); > > echo ("<html><body><pre>"); > > // Create A if it doesn't exist: > if (!isset ($MyA)) > { > echo ("Creating session and instance of MyA...\n\n"); > $MyA = new A; > $Count = 1; // Current Step > echo ("Dump of MyA:\n"); > print_r ($MyA); > echo ("\n<a href=$PHP_SELF>Go to step 2</a>\n"); > } > else > { > // Session is registered already, call method on class B: > $Count++; > echo ("Session is already registered\n"); > echo ("You are now in step $Count. MyA holds:\n"); > print_r ($MyA); > if ($Count == 2) // Step 2, i.e. trigger the bug? > { > echo ("\nCalling method on MyA->Items [0].\n"); > $MyA->Items [0]->SomeFunction (); > echo ("Done. MyA now still holds the same data:\n"); > print_r ($MyA); > echo ("\nIf you go to the next step, you'll notice that the Item\n"); > echo ("on which we just called our method got lost when the session\n"); > echo ("variable was stored by PHP!\n"); > echo ("<a href=$PHP_SELF>Go to the last step</a>"); > } > else > echo ("Notice that MyA->Items [0] no longer exists!"); > } > > echo ("</pre></body></html>"); > ?> > > -- > Edit Bug report at: http://bugs.php.net/?id=7646&edit=1 > > -- > PHP Development Mailing List <http://www.php.net/> > To unsubscribe, e-mail: php-dev-unsubscribe@lists.php.net > For additional commands, e-mail: php-dev-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net tried it out, works fine.... what php version r u running? ONn