Hi @Vitaliy,
After this is applied, when registering for the hook, you can (optionally) specify an additional parameter with priority:
HookRegistry::register('myHook', array($this, 'callback'), HOOK_SEQUENCE_NORMAL);
The HOOK_SEQUENCE_… constants are HOOK_SEQUENCE_CORE, HOOK_SEQUENCE_NORMAL, HOOK_SEQUENCE_LATE, and HOOK_SEQUENCE_LAST (in order of high to low priority).
Regards,
Alec Smecher
Public Knowledge Project Team