title: PHP with APC: Fatal errors: Cannot redeclare class
body: <p>Since I installed APC for PHP with PECL I get sometimes these errors: <code>Cannot redeclare class xxx</code></p>
  
  <p>xxx changes from time to time. I could disable APC but APC improves the performance great! Is there a known bug or could I do something else to prevent these errors? I'm using Ubuntu 8.04 LTS with PHP 5.2.4.</p>
  
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  <p><em>Edit/Update (from comments):</em></p>
  
  <p>I use the Zend Framework Autoloader and these error never occurred before I enabled APC. A few moments ago I get for example that error: <code>Fatal error: require(): Cannot redeclare class zend_db_adapter_abstract in /paths/app/lib/Zend/Db/Select.php on line 27</code></p>