mirror of
https://github.com/smarty-php/smarty.git
synced 2025-10-30 20:01:37 +01:00
82 lines
2.4 KiB
Markdown
82 lines
2.4 KiB
Markdown
# {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.
|
|
|
|
## Attributes
|
|
|
|
| Attribute Name | Required | Description |
|
|
|----------------|----------|------------------------------------------------------|
|
|
| var | Yes | Variable (or string) to evaluate |
|
|
| assign | No | The template variable the output will be assigned to |
|
|
|
|
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.
|
|
|
|
> **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](../../api/caching/basics.md)
|
|
> 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:{$template_code}"}` instead. This may cache
|
|
> the compiled state and thus doesn't have to run the (comparably
|
|
> slow) compiler on every invocation.
|
|
|
|
## Examples
|
|
|
|
The contents of the config file, `setup.conf`.
|
|
|
|
```ini
|
|
emphstart = <strong>
|
|
emphend = </strong>
|
|
title = Welcome to {$company}'s home page!
|
|
ErrorCity = You must supply a {#emphstart#}city{#emphend#}.
|
|
ErrorState = You must supply a {#emphstart#}state{#emphend#}.
|
|
```
|
|
|
|
Where the template is:
|
|
|
|
```smarty
|
|
{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:
|
|
|
|
```html
|
|
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
|
|
<?php
|
|
$str = 'The server name is {$smarty.server.SERVER_NAME|upper} '
|
|
.'at {$smarty.server.SERVER_ADDR}';
|
|
$smarty->assign('foo',$str);
|
|
```
|
|
|
|
Where the template is:
|
|
|
|
```smarty
|
|
{eval var=$foo}
|
|
```
|