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-{eval} {#language.function.eval}
-======
-
-`{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 `assign` attribute, the output of the `{eval}`
-function will be assigned to this template variable instead of being
-output to the template.
-
- 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
-
-> **Note**
->
-> - Evaluated variables are treated the same as templates. They follow
-> the same escapement and security features just as if they were
-> templates.
->
-> - Evaluated variables are compiled on every invocation, the compiled
-> versions are not saved! However if you have [caching](#caching)
-> enabled, the output will be cached with the rest of the template.
->
-> - If the content to evaluate doesn\'t change often, or is used
-> repeatedly, consider using
-> `{include file="string:{$template_code}"}` instead. This may cache
-> the compiled state and thus doesn\'t have to run the (comparably
-> slow) compiler on every invocation.
->
-The contents of the config file, `setup.conf`.
-
-
- emphstart = <strong>
- emphend = </strong>
- title = Welcome to {$company}'s home page!
- ErrorCity = You must supply a {#emphstart#}city{#emphend#}.
- ErrorState = You must supply a {#emphstart#}state{#emphend#}.
-
-
-
-Where the template is:
-
-
- {config_load file='setup.conf'}
-
- {eval var=$foo}
- {eval var=#title#}
- {eval var=#ErrorCity#}
- {eval var=#ErrorState# assign='state_error'}
- {$state_error}
-
-
-
-The above template will output:
-
-
- This is the contents of foo.
- Welcome to Foobar Pub & Grill's home page!
- You must supply a <strong>city</strong>.
- You must supply a <strong>state</strong>.
-
-
-
-This outputs the server name (in uppercase) and IP. The assigned
-variable `$str` could be from a database query.
-
-
- <?php
- $str = 'The server name is {$smarty.server.SERVER_NAME|upper} '
- .'at {$smarty.server.SERVER_ADDR}';
- $smarty->assign('foo',$str);
- ?>
-
-
-
-Where the template is:
-
-
- {eval var=$foo}
-
-