如何使用php中的查询触发IF ELSE

I want to make a trigger ini PHP using IF/ELSE. But when I Try it, it didn't work could you solve this?

Below is the code

IF type='Non-Celup' THEN
BEGIN
UPDATE stock_benang SET
cones=cones-NEW.cones,kg=kg-NEW.kg WHERE id_stock = NEW.id_stock;
END;
ELSEIF type='Celup' THEN
BEGIN
UPDATE stock_benang SET
cones=cones+NEW.cones,kg=kg+NEW.kg WHERE id_stock = NEW.id_stock;
END;