Summary

Returns TRUE if the provided variable is not set (has no value).

Usage

is_unset( target )

Parameters

Name	Type	Description	Required
test	any	The target variable.	Yes.

Returns

TRUE or FALSE.

Description

This operator checks if the target variable is set (has a value). If it is, the operator returns FALSE, otherwise TRUE will be returned.

Examples

Example 1

{def $my_variable=true()}
{if is_unset( $my_variable )}
    Yes.
{else}
    No.
{/if}

The following output will be produced: "No.".

Example 2

{def $my_variable=false()}
{if is_unset( $my_variable )}
    Yes.
{else}
    No.
{/if}

The following output will be produced: "Yes.".

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