Everything

php

circular references

php.internals

Wojtek Meler

23 years ago

When you run:
<?
$a=array();
$b[]=&$a;
$a[]=&$b;
?>

You will get warnings about memory leaks. I know that it is ugly code
etc. but shouldn't it be solved by ZE? It should free such things properly.
I know that in this simple case whole memory is freed, but if we add
resource to $a table, resource desctructor won't be called because
of reference - that's why PHP leeks memory. Am I right?

regards,
Wojtek

(Marcus Börger)

23 years ago

At 19:32 22.05.2003, Wojtek Meler wrote:

>When you run:
><?
>$a=array();
>$b[]=&$a;
>$a[]=&$b;
>?>
>
>You will get warnings about memory leaks. I know that it is ugly code etc.
>but shouldn't it be solved by ZE? It should free such things properly.
>I know that in this simple case whole memory is freed, but if we add
>resource to $a table, resource desctructor won't be called because
>of reference - that's why PHP leeks memory. Am I right?

Putting out the warning is better.
Eventually a damn note that the user shoot his self in the knee.
But that would slow down performance.

AND a side note: even java does not handle that.

regards
marcus

Wojtek Meler

23 years ago

Marcus Börger wrote:

> Putting out the warning is better.
> Eventually a damn note that the user shoot his self in the knee.
> But that would slow down performance.

I know, but memory leaks are pain in back.
There is also another solution - it is possible to call destructor just
before cleaning memory without taking care about
reference numbers. They just shouldn't be unregistered from resources
table before there are still references in
userland.

> AND a side note: even java does not handle that.

hmm...

http://java.sun.com/docs/books/performance/1st_edition/html/JPAppGC.fm.html

it seems they do ...

regards
Wojtek

Wei He

23 years ago

On Thu, 22 May 2003, Wojtek Meler wrote:

> When you run:
> <?
> $a=array();
> $b[]=&$a;
> $a[]=&$b;
> ?>
>

I'm also interested in it but I didn't see the warning on my platform
running your example.

Wei He

Wojtek Meler

23 years ago

Wei He wrote:

>On Thu, 22 May 2003, Wojtek Meler wrote:
>
>
>
>>When you run:
>><?
>>$a=array();
>>$b[]=&$a;
>>$a[]=&$b;
>>?>
>>
>>
>>
>
>I'm also interested in it but I didn't see the warning on my platform
>running your example.
>
>Wei He
>
>
>
>

maybe try 'config.nice --enable-debug' ?