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:
  <literal>{funcname attr1='val1' attr2='val2'}</literal>.
 </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>

 <itemizedlist>
 <listitem><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></listitem>

  <listitem><para>Built-in functions are the
  <emphasis role="bold">inner</emphasis> workings of Smarty, such as
  <link linkend="language.function.if"><varname>{if}</varname></link>,
  <link linkend="language.function.section"><varname>{section}</varname></link> and
  <link linkend="language.function.strip"><varname>{strip}</varname></link>.
  There should be no need to change or modify them.
  </para></listitem>

  <listitem><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">
  <varname>{html_options}</varname></link> and
  <link linkend="language.function.popup"><varname>{popup}</varname></link>
  are examples of custom functions.
 </para></listitem>
</itemizedlist>

 <para>
 See also <link linkend="api.register.function"><varname>register_function()</varname></link>
 </para>
</sect1>

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