Magento: Fatal error: spl_autoload() … line 132

So in dealing with Magento, I’ve ran across the following error:

Fatal error: spl_autoload(): Class Zend_Log_Exception could not be loaded …/lib/Zend/Log/Writer/Stream.php on line 132

We were attempting to use Memcache but each time it was enabled, the site would throw the above mentioned error on the page.  So we had it isolated to Memcache (disable Memcache in local.xml and error goes away) .  Reviewing the log files on the server (/var/log/system.log), we discovered the following:

ERR (3): Warning: ini_set(): Cannot find save handler ‘memcache’  in …app/code/core/Mage/Core/Model/Session/Abstract/Varien.php on line 56

The code was trying to use a memcache handler, but couldn’t find it.  A review of the PHPINFO() output further confirmed that memcache was not a recognized handler:


The session had a memcached handler, but not a memcache handler! 

On the server, I typed php on the command line and discovered the following:

PHP Warning:  PHP Startup: Unable to load dynamic library ‘/usr/lib64/php/modules/’ – /usr/lib64/php/modules/ cannot open shared object file:  No such file or directory in Unknown on line 0

So armed with that knowledge, I check the location to see if, indeed, the file exists.  I discovered the file does, but file does not!


So someone failed to recognize that there are two code bases for Memcache(d): 

The code appeared to be referencing the Memcache handler, but the only code base installed was the Memcached!  After discovery, the Memcache code base was installed on the servers and resolved the issues.

We were able to confirm the presence of the Memcache handler in the PHPINFO() output:


The error went away and we were able to proceed!