File: vendor/squizlabs/php_codesniffer/src/Standards/Squiz/Docs/Classes/LowercaseClassKeywordsStandard.xml

<documentation title="Lowercase Class Keywords">
    <standard>
    <![CDATA[
    The php keywords class, interface, trait, extends, implements, abstract, final, var, and const should be lowercase.
    ]]>
    </standard>
    <code_comparison>
        <code title="Valid: Lowercase class keywords.">
        <![CDATA[
<em>final</em> <em>class</em> Foo <em>extends</em> Bar
{
}
]]>
        </code>
        <code title="Invalid: Initial capitalization of class keywords.">
        <![CDATA[
<em>Final</em> <em>Class</em> Foo <em>Extends</em> Bar
{
}
]]>
        </code>
    </code_comparison>
</documentation>