It's only a hint, but You start checking if the Object Ids are the same or not.
2012/8/13 Robert Cummings <robert@xxxxxxxxxxxxx>:
> 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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