In this new post, Mike Wallner talks about making the move up from his PHP 4.4 environment straight up to PHP 5.2.

Anyway the only issue I really had, in spite testing the code really well over time, was with class_exists() and millions of warnings because of a missing __autoload().

The problem for him was caused by a combination of the new default behavior of the class_exists function and the autoload not included. He does note, thought, that APC works well with the new installation, though (and uses less memory).

In this new post, Mike Wallner talks about making the move up from his PHP 4.4 environment straight up to PHP 5.2.

Anyway the only issue I really had, in spite testing the code really well over time, was with class_exists() and millions of warnings because of a missing __autoload().

The problem for him was caused by a combination of the new default behavior of the class_exists function and the autoload not included. He does note, thought, that APC works well with the new installation, though (and uses less memory).