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{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 a matching {/if}. {else} and {elseif} are also permitted. All PHP conditionals and functions are recognized, such as ||, or, &&, and, is_array(), etc.

If $security is enabled, only PHP functions from the IF_FUNCS array from $security_settings are allowed.

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 7.15. {if} statements

{if $name eq 'Fred'}
    Welcome Sir.
{elseif $name eq 'Wilma'}
    Welcome Ma'am.
    Welcome, whatever you are.

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

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

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

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

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

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

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

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

  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}

{* 0=even, 1=even, 2=even, 3=odd, 4=odd, 5=odd, etc. *}
{if $var is even by 3}


Example 7.16. {if} with more examples

{if isset($name) && $name == 'Blog'}
     {* do something *}
{elseif $name == $foo}
    {* do something *}

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

by Markus Kappe on Feb 17, 2012 at 6:52
Please note, that the spaces around the operator are very important.
{if $name=='John'} {* doesnot work, spaces are missing. *}
  this will never be seen

{if $name == 'John'} {* works just fine *}
  Hello John
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