1<documentation title="Constant Names">
2    <standard>
3    <![CDATA[
4     Constants should always be all-uppercase, with underscores to separate words.
5    ]]>
6    </standard>
7    <code_comparison>
8        <code title="Valid: all uppercase">
9        <![CDATA[
10define('<em>FOO_CONSTANT</em>', 'foo');
11
12class FooClass
13{
14    const <em>FOO_CONSTANT</em> = 'foo';
15}
16        ]]>
17        </code>
18        <code title="Invalid: mixed case">
19        <![CDATA[
20define('<em>Foo_Constant</em>', 'foo');
21
22class FooClass
23{
24    const <em>foo_constant</em> = 'foo';
25}
26        ]]>
27        </code>
28    </code_comparison>
29</documentation>
30