smarty/docs/designers/language-builtin-functions/language-function-if.md

# {if},{elseif},{else}

`{if}` statements in Smarty have much the same flexibility as PHP
[if](https://www.php.net/if) statements, with a few added features for the
template engine. Every `{if}` must be paired with a matching `{/if}`.
`{else}` and `{elseif}` are also permitted. All PHP conditionals and
functions are recognized, such as *\|\|*, *or*, *&&*, *and*,
*is_array()*, etc.

The following is a list of recognized qualifiers, which must be
separated from surrounding elements by spaces. Note that items listed in
\[brackets\] are optional. PHP equivalents are shown where applicable.

## Qualifiers

| Qualifier          | Alternates | Syntax Example       | Meaning                        | PHP Equivalent     |
|--------------------|------------|----------------------|--------------------------------|--------------------|
| ==                 | eq         | $a eq $b             | equals                         | ==                 |
| !=                 | ne, neq    | $a neq $b            | not equals                     | !=                 |
| >                  | gt         | $a gt $b             | greater than                   | >                  |
| <                  | lt         | $a lt $b             | less than                      | <                  |
| >=                 | gte, ge    | $a ge $b             | greater than or equal          | >=                 |
| <=                 | lte, le    | $a le $b             | less than or equal             | <=                 |
| ===                |            | $a === 0             | check for identity             | ===                |
| !                  | not        | not $a               | negation (unary)               | !                  |
| %                  | mod        | $a mod $b            | modulo                         | %                  |
| is \[not\] div by  |            | $a is not div by 4   | divisible by                   | $a % $b == 0       |
| is \[not\] even    |            | $a is not even       | \[not\] an even number (unary) | $a % 2 == 0        |
| is \[not\] even by |            | $a is not even by $b | grouping level \[not\] even    | ($a / $b) % 2 == 0 |
| is \[not\] odd     |            | $a is not odd        | \[not\] an odd number (unary)  | $a % 2 != 0        |
| is \[not\] odd by  |            | $a is not odd by $b  | \[not\] an odd grouping        | ($a / $b) % 2 != 0 |

## Examples
```smarty
{if $name eq 'Fred'}
    Welcome Sir.
{elseif $name eq 'Wilma'}
    Welcome Ma'am.
{else}
    Welcome, whatever you are.
{/if}

{* an example with "or" logic *}
{if $name eq 'Fred' or $name eq 'Wilma'}
   ...
{/if}

{* same as above *}
{if $name == 'Fred' || $name == 'Wilma'}
   ...
{/if}


{* parenthesis are allowed *}
{if ( $amount < 0 or $amount > 1000 ) and $volume >= #minVolAmt#}
   ...
{/if}


{* you can also embed php function calls *}
{if count($var) gt 0}
   ...
{/if}

{* check for array. *}
{if is_array($foo) }
   .....
{/if}

{* check for not null. *}
{if isset($foo) }
   .....
{/if}


{* test if values are even or odd *}
{if $var is even}
   ...
{/if}
{if $var is odd}
   ...
{/if}
{if $var is not odd}
   ...
{/if}


{* test if var is divisible by 4 *}
{if $var is div by 4}
   ...
{/if}


{*
  test if var is even, grouped by two. i.e.,
  0=even, 1=even, 2=odd, 3=odd, 4=even, 5=even, etc.
*}
{if $var is even by 2}
   ...
{/if}

{* 0=even, 1=even, 2=even, 3=odd, 4=odd, 5=odd, etc. *}
{if $var is even by 3}
   ...
{/if}
 
{if isset($name) && $name == 'Blog'}
     {* do something *}
{elseif $name == $foo}
    {* do something *}
{/if}

{if is_array($foo) && count($foo) > 0}
    {* do a foreach loop *}
{/if}
```