Operators
Basic
Various basic operators can be applied directly to variable values.
Examples
{$foo + 1}
{$foo * $bar}
{$foo->bar - $bar[1] * $baz->foo->bar() -3 * 7}
{if ($foo + $bar.test % $baz * 134232 + 10 + $b + 10)}
...
{/if}
{$foo = $foo + $bar}
Note
Although Smarty can handle some very complex expressions and syntax, it is a good rule of thumb to keep the template syntax minimal and focused on presentation. If you find your template syntax getting too complex, it may be a good idea to move the bits that do not deal explicitly with presentation to PHP by way of plugins or modifiers.
List
The following is a list of recognized operators, which must be separated from surrounding elements by spaces. Note that items listed in [brackets] are optional. PHP equivalents are shown where applicable.
Operator | 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 | |
is in | $a is in $b | exists in array | in_array($a, $b) | |
is [not] in | $a is not in $b | does not exist in array | !in_array($a, $b) |
Ternary
You can use the ?:
(or ternary) operator to test one expression and present the value
of the second or third expression, based on the result of the test.
In other words:
will result in OK if$test
is set to true, and in FAIL otherwise.
There is also a shorthand ?:
operator:
$myVar
is not set or set to something that evaluates to false, such as an empty string.
If $myVar
is set to something that evaluates to true, the value of $myVar
is returned. So, the following will
return 'hello':
Testing for null
If "something that evaluates to false" is to broad a test for you, you can use the ??
(or null coalescing) operator
to trigger only if the tested value is undefined or set to null.
$myVar
is not set or set to null.
If $myVar
is set to something that evaluates to anything else, the value of $myVar
is returned. So, the following will
return an empty string (''):