php - OpenCart Call Different Controller -

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i have custom module, , want call add() function checkout/cart. how call controller , function?

i have tried $this->load->controller('checkout/cart'); returns fatal exception.

i using opencart v 1.5.6.4

to solve same issue, use $this->load->controller("checkout/cart/add").

if use getchild, exception thrown : "call undefined method loader::getchild()".

what difference between 2 methods? getchild better?


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