Bug #65340 [Opn]: Memory leak when using magic __set ?

From: Date: Fri, 26 Jul 2013 01:51:01 +0000
Subject: Bug #65340 [Opn]: Memory leak when using magic __set ?
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-180496@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=65340&edit=1

 ID:                 65340
 Updated by:         felipe@php.net
 Reported by:        vitalif at mail dot ru
 Summary:            Memory leak when using magic __set ?
 Status:             Open
 Type:               Bug
 Package:            Class/Object related
 Operating System:   Linux
 PHP Version:        5.5.1
 Block user comment: N
 Private report:     N

 New Comment:

See bug #48197


Previous Comments:
------------------------------------------------------------------------
[2013-07-25 21:38:37] vitalif at mail dot ru

Description:
------------
Hello!

I've discovered that when setting properties via __set() the object takes much more memory than
it should. It's reproducible at least on PHP 5.5 and 5.4. Is it a memory leak?

Test script:
---------------
<?php

// Memory leak somewhere around __set?

class A
{
    var $data = array();
    function __get($k)
    {
        return $this->data[$k];
    }
    function __set($k, $v)
    {
        return $this->data[$k] = $v;
    }
}

$b = new A();

for ($i = 0; $i < 500000; $i++)
    $b->{"a$i"} = 'abc';
var_dump(memory_get_usage()); // int(78318488) - why so big?
$c = clone $b;
unset($b);
var_dump(memory_get_usage()); // int(42220972) - OK

unset($c);
$b = new A();
for ($i = 0; $i < 500000; $i++)
    $b->__set("a$i", 'abc');
var_dump(memory_get_usage()); // int(42221492) - OK


Expected result:
----------------
I expect roughly the same memory usage at all three points. Like:

int(42220972)
int(42220972)
int(42221492)

Actual result:
--------------
The first value is much bigger:

int(78318488)
int(42220972)
int(42221492)


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



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Edit this bug report at https://bugs.php.net/bug.php?id=65340&edit=1

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