PHP with APC: Fatal errors: Cannot redeclare class

Question

Since I installed APC for PHP with PECL I get sometimes these errors: Cannot redeclare class xxx

xxx changes from time to time. I could disable APC but

Answer 1

I just had this happen to me, and I didn't find the solution suggested in any of the other answers. I am using various autoloaders including Composer autoloader and an older version of the Zend Framework Autoloader.

The problem turned out to be caused by a slight name mismatch between the file name and the class name. One character different between the class name and the file name - a discrepancy that a human could easily miss but the a couple of autoloaders successively included the same file, causing the error.