smarty/docs/en/programmers/plugins/plugins-compiler-functions.xml

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   <sect1 id="plugins.compiler.functions"><title>Compiler Functions</title>
    <para>
     Compiler functions are called only during compilation of the template.
     They are useful for injecting PHP code or time-sensitive static
     content into the template. If there is both a compiler function and a
     custom function registered under the same name, the compiler function
     has precedence.
    </para>
    <funcsynopsis>
     <funcprototype>
      <funcdef>mixed <function>smarty_compiler_<replaceable>name</replaceable></function></funcdef>
      <paramdef>string <parameter>$tag_arg</parameter></paramdef>
      <paramdef>object <parameter>&amp;$smarty</parameter></paramdef>
     </funcprototype>
    </funcsynopsis>
    <para>
     The compiler function is passed two parameters: the tag argument
     string - basically, everything from the function name until the ending
     delimiter, and the Smarty object. It's supposed to return the PHP code
     to be injected into the compiled template.
    </para>
    <para>
     See also
     <link linkend="api.register.compiler.function">register_compiler_function()</link>,
     <link linkend="api.unregister.compiler.function">unregister_compiler_function()</link>.
    </para>
    <example>
     <title>simple compiler function</title>
     <programlisting role="php">
<![CDATA[
<?php
/*
 * Smarty plugin
 * -------------------------------------------------------------
 * File:     compiler.tplheader.php
 * Type:     compiler
 * Name:     tplheader
 * Purpose:  Output header containing the source file name and
 *           the time it was compiled.
 * -------------------------------------------------------------
 */
function smarty_compiler_tplheader($tag_arg, &$smarty)
{
    return "\necho '" . $smarty->_current_file . " compiled at " . date('Y-m-d H:M'). "';";
}
?>
]]>
</programlisting>
     <para>
      This function can be called from the template as:
     </para>
     <programlisting>
{* this function gets executed at compile time only *}
{tplheader}
     </programlisting>
     <para>
      The resulting PHP code in the compiled template would be something like this:
     </para>
     <programlisting role="php">
<![CDATA[
<?php
echo 'index.tpl compiled at 2002-02-20 20:02';
?>
]]>
     </programlisting>
    </example>
   </sect1>

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