#42758 [Opn]: memory leak in class method calls

[benoit dot heinrich at swisscom dot com]

 ID:               42758
 User updated by:  benoit dot heinrich at swisscom dot com
 Reported By:      benoit dot heinrich at swisscom dot com
 Status:           Open
 Bug Type:         Unknown/Other Function
 Operating System: linux
 PHP Version:      4.4.7
 New Comment:

Hi again,

I made some research to try to find out what is the exact reason of the
memory leak.

So I first try to replace the set method by a very simple method that
does nothing:

class ClassA
{
        function method()
        {
        }
}


Then I tried to remove the 'for' loop and I created a test case with
10000 call to $obj->method(); and again I got the memory leak.

So my 2 cents that is a bug in the PHP engine call stack where it keeps
a pointer somewhere to the object that is calling the method.


Hope it helps.
/Benoit


Previous Comments:
------------------------------------------------------------------------

[2007-09-25 14:09:33] benoit dot heinrich at swisscom dot com

Description:
------------
Hi,

There is a memory leak when calling a method of a class.
I know the bug is fixed in PHP5 but for business reasons we can't
afford to upgrade to php5 right now.

Is that possible to fix this very annoying issue?


/Benoit

Reproduce code:
---------------
<?php

class ClassA
{
        var $member;
        
        function setMember($value)
        {
                $this->member = $value;
        }
}

$obj =& new ClassA();
$mem = memory_get_usage();
for ($i=0; $i< 1000000; $i++)
        $obj->member = null;

print "Direct property set memory leak is " .
number_format(memory_get_usage()-$mem) . "\n";

$mem = memory_get_usage();
for ($i=0; $i< 1000000; $i++)
        $obj->setMember(null);
        
print "Method call memory leak is " .
number_format(memory_get_usage()-$mem) . "\n";

?>

Expected result:
----------------
Direct property set memory leak is 0
Method call memory leak is 0


Actual result:
--------------
Direct property set memory leak is 128
Method call memory leak is 8,000,040



------------------------------------------------------------------------


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Edit this bug report at http://bugs.php.net/?id=42758&edit=1