repo_zf1/documentation/manual/en/ref/migration-introduction.xml

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<sect1 id="migration.introduction">
    <title>Introduction</title>

    <para>
        When you are working with Zend Framework for a longer time, then you may
        want to upgrade to new releases as new features are integrated and found
        bugs are fixed.
    </para>

    <para>
        We at Zend Framework try to prevent possible problems which you may have
        when you are in need to do a upgrade. Backwards compatibility is one of our
        main goals.
    </para>

    <para>
        Still, from time to time, it is not possible or even necessary to make
        changes which have effect on your code, to prevent or solve other problems.
        To help you to detect possible changes you may need to do when upgrading
        to a new Zend Framework release, you should carefully read this section.
    </para>

    <para>
        Below you will find informations about all known changes which can have
        effect on your code, and examples for you about necessary changes you
        have to do when doing an upgrade.
    </para>
</sect1>
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