{if not isset} Smarty

Question

what is the code for smarty for if (!isset($var)){ ?

if using {if $x eq \'5\'} when $x is not defined in smarty , it gives an error function call

Answer 1

{if ! isset($var)}
body must be at least 30 characters. :)
{/if}

Answer 2

Try this.

{if $missing_var|default:FALSE}
NOT MISSING
{else}
MISSING
{/if}

Answer 3

Try This

{if $var}
   Active
{else}
   Inactive
{/if}