Smarty php-function inside assing

Question

Trying to assign but without success:

{assign "var_name" {is_numeric($var->test) ? $var->test : ''}}

In php it would be like

$var_name = is_numeric($var->test) ? $var->test : '';

Answer 1

It should be like this:

{assign var_name {(is_numeric($var->test)) ? $var->test : ''}}