MMCache Conflicts with Mediaplugin Filter

I am making a new server and installed PHP 4.3.4 (by Server Logistics with MMCache builtin). This PHP goes with Server Logistics Apache2 and works well so far with Moodle 1.3. After enabling MMCache and turning on the mediaplugin filter of Moodle, I get this error message...

Fatal error: Cannot redeclare mediaplugin_filter() in /Library/Apache2/htdocs/courses/filter/mediaplugin/filter.php on line 28

If I turn off the mediaplugin, no error message. If I disable MMCache, the mediaplugin is OK, no error message.

I checked the MMCache documentation at SourceForge and tried to make the mmcache.filter setting ignore filter.php with the ! marker (see below) but no effect.

[mmcache php.ini settings]

zend_extension=/Library/PHP4/lib/php/extensions/no-debug-non-zts-20020429/mmcache.so

mmcache.shm_size=16

mmcache.cache_dir=/tmp/mmcache

mmcache.enable=1

mmcache.optimizer=1

mmcache.check_mtime=1

mmcache.debug=0

mmcache.filter=*.php !filter.php

mmcache.shm_max=0

mmcache.shm_ttl=0

mmcache.shm_prune_period=0

mmcache.shm_only=0

mmcache.compress=1

So is there a simple adjustment I can do? Or should I try a different php accelerator or forget about using one?

Many thanks