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 + $bar}
Note
Although Smarty can handle some very complex expressions and syntax, it is a good rule of thumb to keep the template syntax minimal and focused on presentation. If you find your template syntax getting too complex, it may be a good idea to move the bits that do not deal explicitly with presentation to PHP by way of plugins or modifiers.
Ternary
You can use the ?:
(or ternary) operator to test one expression and present the value
of the second or third expression, based on the result of the test.
In other words:
will result in OK if$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 (''):