ID: 36847 User updated by: [EMAIL PROTECTED] Reported By: [EMAIL PROTECTED] -Status: Bogus +Status: Open -Bug Type: Scripting Engine problem +Bug Type: Documentation problem Operating System: fc3 PHP Version: 5CVS-2006-03-24 (snap) Assigned To: dmitry New Comment:
OK, nice, that explains the difference to php4. unset($res) is not sufficient ... obviously, <?php class test { var $backtrace = null; function test() { $this->backtrace = debug_backtrace(); unset($this->backtrace[0]['object']); } } set_time_limit(0); for($i = 0; $i <= 500000; $i++) { $ret = &new test(); unset($ret); } ?> does not break anymore. However, this circular reference is due to the new 'object' returned by debug_backtrace() which is not documented. It merits a *big* warning. Also, it had been nice to be able to do it by __destruct() , but it's not called by unset() ... I report back to pear , thanks ! Previous Comments: ------------------------------------------------------------------------ [2006-04-12 11:58:42] [EMAIL PROTECTED] Backtrace information that is returned from debug_backtrace() contains reference to $this object. So this examle creates circular data structure. PHP cannot free circular structures at runtime and does free them on request shutdown. So this bug is the same as bug #33595 (recursive references leak memory). ------------------------------------------------------------------------ [2006-03-26 06:09:54] [EMAIL PROTECTED] This not the same situation as #33487 Here, it's not a question of local variable within a method. And we actually unset the created object. If I do the same with $this->backtrace = str_pad(' ', 2300); then the memory is not eaten up. This occurs only if debug_backtrace() result is affected to a property of the test object. ------------------------------------------------------------------------ [2006-03-26 01:03:57] [EMAIL PROTECTED] Duplicate of bug #33487. ------------------------------------------------------------------------ [2006-03-24 16:56:03] [EMAIL PROTECTED] Description: ------------ It was originated by http://pear.php.net/bugs/bug.php?id=6788 Reproduce code: --------------- <?php class test { var $backtrace = null; function test() { $this->backtrace = debug_backtrace(); } } set_time_limit(0); for($i = 0; $i <= 10000; $i++) { $ret = &new test(); unset($ret); } ?> Expected result: ---------------- nothing Actual result: -------------- memory exhausted ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=36847&edit=1