{if not isset} Smarty

问题

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 'get_template_vars' is unknown or deprecated. . this is what i believe so far as i lost hope in trying to know where did this error come from !

Thanky you .

回答1:

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

回答2:

Try this.

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

回答3:

Try This

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

来源：https://stackoverflow.com/questions/5952778/if-not-isset-smarty