fenom/docs/en/tags/var.md

Tag {var}

The tag {var} is used for assigning template variables during the execution of a template.

{var $var=EXPR}

{var $var}
  ... any content ...
{/var}

{var $var|modifiers}
  ... any content ...
{/var}

Variable names follow the same rules as other labels in PHP. A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores.

{var $v = 5}
{var $v = "value"}

{var $v = $x+$y}
{var $v = 4}
{var $v = $z++ + 1}
{var $v = --$z}
{var $v = $y/$x}
{var $v = $y-$x}
{var $v = $y*$x-2}
{var $v = ($y^$x)+7}

Creating array

{var $v = [1,2,3]}
{var $v = []}
{var $v = ["one"|upper => 1, 4 => $x, "three" => 3]}
{var $v = ["key1" => $y*$x-2, "key2" => ["z" => $z]]}

Getting function result into variable

{var $v = count([1,2,3])+7}

Collect the output of the template into a variable

{var $v}
    Some long {$text|trim}
{/var}

{var $v|escape} {* apply modifier to variable*}
    Some long {$text|trim}
{/var}