Hi,
We have since deployed another webserver machine and observe the exact
same behavior there.
So it is not a hardware problem.
We have also disabled various php modules, but this didn't help either.
Any debug suggestions are welcome! :)
Reto
On Tue, Aug 14, 2012 at 10:40 AM, Reto Kaiser <reto@xxxxxxxxxxxxx> wrote:
> Hi,
>
> Thanks for your input Robert and Volmar! I have googled again with
> "instance variable" instead of "class variable" - but have not found
> any similar reports.
>
> I'm pretty sure those are the same objects. The application usually
> runs alright. We only see the instance variables becoming NULL since
> about a week.
>
> We had 3 small software upgrade coming from debian since we observe
> the problem. We think they cannot be related. Still we have reverted
> all of those and still see the problem.
> Next step is that we setup a exact copy of the machine. Maybe it is a
> hardware problem...
>
> Thanks,
> Reto
>
> On Mon, Aug 13, 2012 at 5:09 PM, Robert Cummings <robert@xxxxxxxxxxxxx> wrote:
>> On 12-08-12 08:32 AM, Reto Kaiser wrote:
>>>
>>> Hi,
>>>
>>> So I have this strange situation where I assign a classvariable a
>>> value, but when I read the value it is NULL.
>>>
>>> The class has one variable declared:
>>> =========
>>> class A {
>>> private $_cookies;
>>> }
>>> =========
>>
>>
>> That is a private instance variable NOT a class variable.
>>
>> To declare a class variable you would do the following:
>>
>> <?php
>>
>> class A
>> {
>> private static $_cookies;
>> }
>>
>> ?>
>>
>>
>>> In a method of this class I assign this classvariable plus an
>>> undeclared classvariable and a local variable the value 1:
>>> =========
>>> $this->_cookies = 1;
>>> $this->_cookies2 = 1;
>>> $cookies3 = 1;
>>> =========
>>>
>>> When I now read the values of those variables, the classvariables are
>>> NULL while the local variable is 1:
>>> =========
>>> $logEntry .= 'cookies: ' . var_export($this->_cookies, true) . PHP_EOL;
>>> $logEntry .= 'cookies2: ' . var_export($this->_cookies2, true) . PHP_EOL;
>>> $logEntry .= 'cookies3: ' . var_export($cookies3, true) . PHP_EOL;
>>> =========
>>> cookies: NULL
>>> cookies2: NULL
>>> cookies3: 1
>>> =========
>>>
>>> But when reading the whole object, the classvariables are 1:
>>> =========
>>> $logEntry .= var_export($this, true) . PHP_EOL;
>>> =========
>>> A::__set_state(array(
>>> '_cookies' => 1,
>>> '_cookies2' => 1,
>>> ))
>>> =========
>>>
>>>
>>> This happens periodically on a busy webserver. It seems that when it
>>> happens, all classvariables cannot be read anymore (return NULL).
>>> After restarting Apache it does not happen anymore, just to happen
>>> again after some minutes.
>>>
>>> The system is current Debian Squeeze:
>>> Linux: linux-image-2.6.32-5-amd64
>>> Apache: apache2-mpm-prefork 2.2.16-6+squeeze7
>>> PHP: PHP 5.3.3-7+squeeze13 with Suhosin-Patch (cli) (built: Jun 10
>>> 2012 07:31:32)
>>> php -m:
>>> https://raw.github.com/gist/3331641/2f7e80bd03abfb728b659634d3f4bac0131f4d6a/gistfile1.txt
>>> php -i:
>>> https://raw.github.com/gist/3331651/bcf6e3654bf391482627505447848de173d0bbab/gistfile1.txt
>>>
>>> Does anyone have an idea what could cause this, or how to further debug?
>>
>>
>> I can't really speak to your specific problem (unless you're using two
>> different instances of the class), just thought I'd clear up the difference
>> between class variables and instance variables.
>>
>> Cheers,
>> Rob.
>> --
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