85 lines
2.4 KiB
Markdown
85 lines
2.4 KiB
Markdown
{eval} {#language.function.eval}
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======
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`{eval}` is used to evaluate a variable as a template. This can be used
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for things like embedding template tags/variables into variables or
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tags/variables into config file variables.
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If you supply the `assign` attribute, the output of the `{eval}`
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function will be assigned to this template variable instead of being
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output to the template.
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Attribute Name Type Required Default Description
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---------------- -------- ---------- --------- ------------------------------------------------------
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var mixed Yes *n/a* Variable (or string) to evaluate
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assign string No *n/a* The template variable the output will be assigned to
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> **Note**
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>
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> - Evaluated variables are treated the same as templates. They follow
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> the same escapement and security features just as if they were
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> templates.
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>
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> - Evaluated variables are compiled on every invocation, the compiled
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> versions are not saved! However if you have [caching](#caching)
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> enabled, the output will be cached with the rest of the template.
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>
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> - If the content to evaluate doesn\'t change often, or is used
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> repeatedly, consider using
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> `{include file="string:{$template_code}"}` instead. This may cache
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> the compiled state and thus doesn\'t have to run the (comparably
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> slow) compiler on every invocation.
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>
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The contents of the config file, `setup.conf`.
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emphstart = <strong>
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emphend = </strong>
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title = Welcome to {$company}'s home page!
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ErrorCity = You must supply a {#emphstart#}city{#emphend#}.
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ErrorState = You must supply a {#emphstart#}state{#emphend#}.
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Where the template is:
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{config_load file='setup.conf'}
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{eval var=$foo}
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{eval var=#title#}
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{eval var=#ErrorCity#}
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{eval var=#ErrorState# assign='state_error'}
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{$state_error}
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The above template will output:
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This is the contents of foo.
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Welcome to Foobar Pub & Grill's home page!
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You must supply a <strong>city</strong>.
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You must supply a <strong>state</strong>.
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This outputs the server name (in uppercase) and IP. The assigned
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variable `$str` could be from a database query.
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<?php
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$str = 'The server name is {$smarty.server.SERVER_NAME|upper} '
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.'at {$smarty.server.SERVER_ADDR}';
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$smarty->assign('foo',$str);
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?>
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Where the template is:
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{eval var=$foo}
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