In Smarty, how does one determine whether a variable is a string or an array?

In Smarty, how does one determine whether a variable is a string or an array? There is a variable such as $ data. how can we determine whether it is a string or an array in the template ?, In {ifis_array ($ data)} yes {else} no {/if} Smarty, how does one determine whether a variable is a string or an array?
There is a variable such as $ data

In the template, how can I determine whether a string or an array is used?

------ Solution --------------------
{If is_array ($ data )}
Yes
{Else}
No
{/If}