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smarty/docs/designers/language-modifiers/language-modifier-empty.md

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# empty
Returns true if var does not exist or has a value that is empty or equal to zero, aka falsey, see conversion to boolean. Otherwise returns false.
## Basic usage
```smarty
{if $myVar|empty}it's an empty variable{/if}
{if empty($myVar)}it's an empty variable{/if}
```