repo_zf1/documentation/manual/en/tutorials/plugins-conclusion.xml

<?xml version="1.0" encoding="UTF-8"?>
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<sect1 id="learning.plugins.conclusion">
    <title>Conclusion</title>

    <para>
        Understanding the concept of prefix paths and overriding existing plugins will help you with
        your understanding of many components within the framework. Plugins are used in a variety of
        places:
    </para>

    <itemizedlist>
        <listitem>
            <para>
                <classname>Zend_Application</classname>: resources.
            </para>
        </listitem>

        <listitem>
            <para>
                <classname>Zend_Controller_Action</classname>: action helpers.
            </para>
        </listitem>

        <listitem>
            <para>
                <classname>Zend_Feed_Reader</classname>: plugins.
            </para>
        </listitem>

        <listitem>
            <para>
                <classname>Zend_Form</classname>: elements, filters, validators, and decorators.
            </para>
        </listitem>

        <listitem>
            <para>
                <classname>Zend_View</classname>: view helpers.
            </para>
        </listitem>
    </itemizedlist>

    <para>
        And several more places, besides. Learn the concepts early so you can leverage this
        important extension point in Zend Framework.
    </para>

    <note>
        <title>Caveat</title>

        <para>
            We'll note here that <classname>Zend_Controller_Front</classname> has a plugin system -
            but it does not adhere to any of the guidelines offerred in this tutorial. The plugins
            registered with the front controller must be instantiated directly and registered
            individually with it. The reason for this is that this system predates any other plugin
            system in the framework, and changes to it must be carefully weighed to ensure existing
            plugins written by developers continue to work with it.
        </para>
    </note>
</sect1>