Manual:$wgHooks/en

Details
Global list of hooks. It is an array of arrays: it specifies for every event an array of functions to be called. It is an array of arrays: it specifies for every event an array of functions to be called.

Add a hook by doing:

or:

or:

or:

In the last case, the callback is expected to be a method in $object of the same name as the event preceded by "on", e.g. "onUnknownAction"