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<a name="plugins.writing"></a>Writing Plugins</h2></div></div></div>
<p>
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.
</p>
<p>
For the plugins that are registered at runtime, the name of the plugin
function(s) does not have to follow the naming convention.
</p>
<p>
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:
</p>
<pre class="programlisting">
<?php
require_once $smarty->_get_plugin_filepath('function', 'html_options');
?>
</pre>
<p>
As a general rule, Smarty object is always passed to the plugins
as the last parameter with two exceptions:
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modifiers do not get passed the Smarty object at all
</p></li>
<li class="listitem"><p>
blocks get passed
<em class="parameter"><code>$repeat</code></em> after the Smarty object to keep
backwards compatibility to older versions of Smarty.
</p></li>
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