Manual:$wgHooks

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

Add a hook by doing:

$wgHooks['event_name'][] = 'function';

or:

$wgHooks['event_name'][] = array( 'function', $data );

or:

$wgHooks['event_name'][] = array( $object, 'method' );

or:

$wgHooks['event_name'][] = $object;

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"

Note, hooks are called when events happen, where a hook is a PHP function, and an event is an abstract concept.