function inside BUILT-IN EVENTs functions OF phpRunner

hey guys... i somehow used already to ALL the Built-in FUnctions in phpRunner.... but..

PROBLEM :

i have a lot of repeated php code and validation inside BeforeADD AND EDIT EVENTS.....

QUESTION:

how can i CREATE and CALL a FUNCTION INSIDE the built-in EVENT FUNCTION OF phpRunner.?

so that i can only write codes once.. and use it by simply calling the functions during BEFORE AND AFTER EVENTS..
can i do that in phprunner...??.i mean i want to create a function within the phpRunner project not destroying codes generated nor using other applications.