[SMARTY] function call within function call

Hello,

I'm looking for possibly combining two plugins.

Depending on the assigned variable {$actype} I want to retrieve related 
data from a database by using function {get_supplier} and use the result 
as parameter for function {checkfield}

***
The way it worked before (all supplier data in array and assigned as 
$supplier_default):

{checkfield data=$supplier value=$supplier_value 
default=$supplier_default.$actype}

***
The way I'd rather have it to work (but it doesn't):

{checkfield data=$supplier value=$supplier_value 
default=get_supplier($actype)}

function smarty_function_get_supplier($params, &$smarty)
{
	/* database query */
	$res=array(1,2,3);
	return $res;
}

***
Both functions are named right (function.checkfield.php, 
function.get_supplier.php) in the assigned plugins-directory.

Is a function call within a function call possible? What'd be the proper 
syntax to achieve the desired?

Thanks and greetings,
Peggy

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