How to call a method in a. dwt file in Ecshop, what is the code

How do I call a method in a. dwt file in Ecshop, what is the code?
How do I call a method in a. dwt file in Ecshop, what is the code? Is it written in a. dwt?

function A () {$smarty->assign (' A ', $a); $smarty->display ('. dwt ');}

I just want to know how to call this method a in. dwt
------Solution--------------------

function A () {
$smarty->assign (' A ', $a);//smarty assign a value to a template? If so, then the view of this frame is smarty
$smarty->display ('. DWT ');//If it's smarty, it's just. DWT, I'm afraid not. Oh, look at the display function of Smarty.
A is not a method, is a variable bar, in the DWT is a variable, but he is not a global variable, just smarty a variable,. DWT type of view file, Smarty will turn it into PHP file, you search all PHP files under your server, file name is long with% is the converted file, you open look, search like _tpl_var (specifically I forgot) the habitat know what's going on
}

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