Method for unregistering PHP classes

[bergie]

When Midgard is used together with the Runtime, all execution for the site is done in a single PHP AppServer process. This means classes are loaded only once.

This is however an issue when we think of users editing their PHP snippets using the MVC code editor. As the classes are loaded, and stay loaded, the only way to get their code changes to register is by restarting the server.

If we had a method for unregistering classes then this wouldn't be necessary, class could just be unregistered and registered again as part of cache invalidation MVC does.

[indeyets]

this should, probably, be enough for this:

zend_hash_del(CG(class_table), class_name, class_name_length+1) 

but this should be seriously tested and limited:

• we, probably, want to unregister only limited subset of classes
• noone knows what would happen if we remove the class, but there are still objects of that class instantiated