smarty/docs/en/programmers/plugins/plugins-writing.xml

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   <sect1 id="plugins.writing">
    <title>Writing Plugins</title>
    <para>
     Plugins can be either loaded by Smarty automatically from the
     filesystem or they can be registered at runtime via one of the
     register_* API functions. They can also be unregistered by using
     unregister_* API functions.
    </para>
    <para>
     For the plugins that are registered at runtime, the name of the plugin
     function(s) does not have to follow the naming convention.
    </para>
    <para>
     If a plugin depends on some functionality provided by another plugin
     (as is the case with some plugins bundled with Smarty), then the proper
     way to load the needed plugin is this:
    </para>
    <programlisting role="php">
<![CDATA[
<?php
require_once $smarty->_get_plugin_filepath('function', 'html_options');
?>
]]>
    </programlisting>
    <para>
     As a general rule, Smarty object is always passed to the plugins
     as the last parameter (with two exceptions: modifiers do not get
     passed the Smarty object at all and blocks get passed
     <parameter>&amp;$repeat</parameter> after the Smarty object to keep
     backwards compatibility to older versions of Smarty).
    </para>
   </sect1>

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