Bug #65340 [Com]: Memory leak when using magic __set ?
Edit report at https://bugs.php.net/bug.php?id=65340&edit=1
ID: 65340
Comment by: vitalif at mail dot ru
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:
Anyone? I've rechecked it on 5.5.4 - the bug is still there.
Previous Comments:
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[2013-07-27 21:32:43] vitalif at mail dot ru
I don't think bug #48197 is related to this issue... There are no memory leaks. I.e. extra
alloc done by __call in that bug is freed without problem (if you remove "$b[$i] =" and
just throw away the value after each call).
And here I describe that an identical object takes twice more memory if you write in its array
property using __set.
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[2013-07-26 01:51:01] felipe@php.net
See bug #48197
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[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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