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# eval

Attribute Name | Type | Required | Default | Description
--- | --- | --- | --- | ---
var | mixed | Yes | n/a | variable (or string) to evaluate
assign | string | No | n/a | the template variable the output will be assigned to

eval is used to evaluate a variable as a template. This can be used for things like embedding template tags/variables into variables or tags/variables into config file variables.

If you supply the special "assign" attribute, the output of the eval function will be assigned to this template variable instead of being output to the template.

> Technical Note: Evaluated variables are treated the same as templates. They follow the same escapement and security features just as if they were templates.

> Technical Note: Evaluated variables are compiled on every invocation, the compiled versions are not saved! However if you have caching enabled, the output will be cached with the rest of the template.

Example 8-4. eval
    setup.conf
    ----------

    emphstart = <b>
    emphend = </b>
    title = Welcome to {$company}'s home page!
    ErrorCity = You must supply a {#emphstart#}city{#emphend#}.
    ErrorState = You must supply a {#emphstart#}state{#emphend#}.

    index.tpl
    ---------

    {config_load file="setup.conf"}

    {eval var=$foo}
    {eval var=#title#}
    {eval var=#ErrorCity#}
    {eval var=#ErrorState# assign="state_error"}
    {$state_error}

    OUTPUT:

    This is the contents of foo.
    Welcome to Foobar Pub & Grill's home page!
    You must supply a <b>city</b>.
    You must supply a <b>state</b>.

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