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We use xcache as a php caching mechanism on our servers.
Its pretty painless for us for the most part.

One of our clients did complain that their app was now crapping out.

A check of the software forums for that app (ActiveCollab) showed that it was an issue with PHP5.3.2 and XCache and ActiveCollab.
So, needed to disable Xcache.

This should be relatively easy I thought, but the documentation sucks, so took a while to find out how.
Its pretty simple to do though.

Assuming you’ve allowed htaccess files in apache, you can do the below –

Add an htaccess file in the root folder of the website with the following info

php_flag xcache.cacher Off
php_flag xcache.size 0
php_flag xcache.stat Off

Thats it.