<documentation title="Constant Visibility">
    <standard>
    <![CDATA[
    Visibility must be declared on all class constants if your project PHP minimum version supports constant visibilities (PHP 7.1 or later).

    The term "class" refers to all classes, interfaces, enums and traits.
    ]]>
    </standard>
    <code_comparison>
        <code title="Valid: Constant visibility declared.">
        <![CDATA[
class Foo
{
    <em>private const</em> BAR = 'bar';
}
        ]]>
        </code>
        <code title="Invalid: Constant visibility not declared.">
        <![CDATA[
class Foo
{
    <em>const</em> BAR = 'bar';
}
        ]]>
        </code>
    </code_comparison>
</documentation>