The extension_loaded() function might serve you better than
class_exists().
http://www.php.net/manual/en/function.extension-loaded.php
Cheers,
Rob.
On Fri, 2003-08-29 at 09:17, Andrey Hristov wrote:
> Hi,
> till today I had a big problem with my Apache 1.3 segfaulting when I try to
> instantiate from a class. The class is declared in a C extesion (named
> xml_parser.so, class name WebgateXMLParser). Few week after the
> implementation it worked well since I just loaded the extension with dl() :
> dl('xml_parser.so').
> At some point I decided to include a check whether the module is loaded
> (compiled statically) and in this case not to dl() it. Just around the time
> I
> implemented (in PHP) this check my Apache/PHP started to core. Sadly
> I found the reason just today.
> My check is this :
> if (!class_exists('WebgateXmlParser')) { // if it's built into the PHP
> binary don't load
> dl('xml_parser.so');
> }// if
> What happens? After the request is finished the module is unloaded - this
> can easily be seen just
> by doing a var_dump(get_loaded_extensions()); before the "if". However
> PHP/Zend still thinks that
> there is WebgateXmlParser class. Briefly : Zend DOES NOT unregister classes
> on module unload.
> Now you may imagine what happens when the extension is not loaded since Zend
> Engine thinks that
> the class exists (but it does not) and the code tries to instantiate an
> object of the class - core dump.
>
> IMO IT IS a bug that the class entries are not unregistered when the module
> is unloaded after the request. I have not tried this but the same error may
> apply to functions exported by a C extension and thus leading
> to the same effect - crashes that are hard to explain.
>
>
>
> Regards,
> Andrey
>
> P.S.
> Yes, there is a workaround for my case : to check whether the module is
> loaded but not checking whether the class exists.
>
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>
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