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90 lines
2.9 KiB
Markdown
90 lines
2.9 KiB
Markdown
# {function}
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`{function}` is used to create functions within a template and call them
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just like a plugin function. Instead of writing a plugin that generates
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presentational content, keeping it in the template is often a more
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manageable choice. It also simplifies data traversal, such as deeply
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nested menus.
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> **Note**
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>
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> Template functions are defined global. Since the Smarty compiler is a
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> single-pass compiler, The [`{call}`](#language.function.call) tag must
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> be used to call a template function defined externally from the given
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> template. Otherwise, you can directly use the function as
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> `{funcname ...}` in the template.
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## Attributes
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| Attribute Name | Required | Description |
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|----------------|----------|---------------------------------------------------------------|
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| name | Yes | The name of the template function |
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| \[var \...\] | No | default variable value to pass local to the template function |
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- The `{function}` tag must have the `name` attribute which contains
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the name of the template function. A tag with this name can be
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used to call the template function.
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- Default values for variables can be passed to the template function
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as [attributes](../language-basic-syntax/language-syntax-attributes.md). Like in PHP function
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declarations you can only use scalar values as default. The default
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values can be overwritten when the template function is being
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called.
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- You can use all variables from the calling template inside the
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template function. Changes to variables or new created variables
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inside the template function have local scope and are not visible
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inside the calling template after the template function is executed.
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> **Note**
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>
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> You can pass any number of parameter to the template function when it
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> is called. The parameter variables must not be declared in the
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> `{funcname ...}` tag unless you what to use default values. Default
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> values must be scalar and can not be variable. Variables must be
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> passed when the template is called.
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## Examples
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```smarty
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{* define the function *}
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{function name=menu level=0}
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{function menu level=0} {* short-hand *}
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<ul class="level{$level}">
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{foreach $data as $entry}
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{if is_array($entry)}
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<li>{$entry@key}</li>
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{menu data=$entry level=$level+1}
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{else}
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<li>{$entry}</li>
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{/if}
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{/foreach}
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</ul>
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{/function}
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{* create an array to demonstrate *}
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{$menu = ['item1','item2','item3' => ['item3-1','item3-2','item3-3' =>
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['item3-3-1','item3-3-2']],'item4']}
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{* run the array through the function *}
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{menu data=$menu}
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```
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Will generate the following output
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```
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* item1
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* item2
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* item3
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o item3-1
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o item3-2
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o item3-3
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+ item3-3-1
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+ item3-3-2
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* item4
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```
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See also [`{call}`](./language-function-call.md)
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