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