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

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<sect1 id="language.syntax.functions">
 <title>Functions</title>
 <para>
  Every Smarty tag either prints a
  <link linkend="language.variables">variable</link> or invokes some sort
  of function. These are processed and displayed by enclosing the
  function and its
  <link linkend="language.syntax.attributes">attributes</link>
  within delimiters like so: {funcname
  attr1='val1' attr2='val2'}.
 </para>
 <example>
  <title>function syntax</title>
  <programlisting>
<![CDATA[
{config_load file='colors.conf'}

{include file='header.tpl'}
{insert file='banner_ads.tpl' title='Smarty is cool'}

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

{include file='footer.tpl' ad=$random_id}
]]>
  </programlisting>
 </example>
 <para>
  Both <link linkend="language.builtin.functions">built-in functions</link>
  and <link linkend="language.custom.functions">custom functions</link>
  have the same syntax within templates.
  </para>
  <para>Built-in functions are the
  <emphasis role="bold">inner</emphasis> workings of Smarty, such as
  <link linkend="language.function.if">{if}</link>,
  <link linkend="language.function.section">{section}</link> and
  <link linkend="language.function.strip">{strip}</link>.
  There should be no need to change or modify them.
  </para>
  <para>Custom functions are <emphasis role="bold">additional</emphasis>
  functions implemented via <link linkend="plugins">plugins</link>.
  They can be modified to your liking, or you can create new ones.
  <link linkend="language.function.html.options">{html_options}</link> and
  <link linkend="language.function.popup">{popup}</link>
  are examples of custom functions.
 </para>
 
 <para>
 See also <link linkend="api.register.function">register_function()</link>
 </para>
</sect1>

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