{if} statements in Smarty have much the same flexibility as PHP
if
statements, with a few added features for the template engine.
Every {if} must be paired with an
{/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.

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

modulous

%

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

Example 7-8. {if} statements

{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}