smarty/docs/en/designers/language-basic-syntax/language-syntax-functions.xml

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<sect1 id="language.syntax.functions">
 <title>Functions</title>
 <para>
  Each Smarty tag either prints a
  <link linkend="language.variables">variable</link> or invokes some sort
  of function. Functions are processed and displayed by enclosing the
  function and its attributes into delimiters like so: {funcname
  attr1="val" attr2="val"}.
 </para>
 <example>
  <title>function syntax</title>
  <programlisting>
<![CDATA[
{config_load file="colors.conf"}

{include file="header.tpl"}

{if $highlight_name}
    Welcome, <font color="{#fontColor#}">{$name}!</font>
{else}
    Welcome, {$name}!
{/if}

{include file="footer.tpl"}
]]>
  </programlisting>
 </example>
 <para>
  Both built-in functions and custom functions have the same syntax in
  the templates. Built-in functions are the inner workings of Smarty,
  such as <link linkend="language.function.if"><command>if</command></link>, <link linkend="language.function.section"><command>section</command></link> and
  <link linkend="language.function.strip"><command>strip</command></link>. They cannot be modified. Custom functions are
  additional functions implemented via plugins. They can be modified to
  your liking, or you can add new ones. <link linkend="language.function.html.options"><command>html_options</command></link> and
  <link linkend="language.function.html.select.date"><command>html_select_date</command></link> are examples of custom functions.
 </para>
</sect1>
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