Igor Kromin |   Consultant. Coder. Blogger. Tinkerer. Gamer.

I've come across a requirement in some of my Smarty templates to check if a value of a variable appears in an array. The PHP in_array function does this for you and according to the Smarty documentation any PHP function can be used as a variable modifier so this should be very easy to implement.
Variable modifiers can be applied to variables, custom functions or strings. To apply a modifier, specify the value followed by a | (pipe) and the modifier name. A modifier may accept additional parameters that affect its behavior. These parameters follow the modifer name and are separated by a : (colon). Also, all php-functions can be used as modifiers implicitly (more below) and modifiers can be combined. .

So lets say my variable is named $my_fruit and I want to check if the value is in this array: ['apples', 'oranges', 'peaches', 'dragonfruit']. This is what it would look like in Smarty...
{if $my_fruit|in_array:['apples', 'oranges', 'peaches', 'dragonfruit']}
My fruit is in the array

The syntax can be a little confusing. The variable is specified first, followed by the pipe character, then the in_array function. A colon is used to specify an input parameter to the in_array function, which happens to be the array of fruit from above.


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