1<documentation title="Unused function parameters">
2    <standard>
3    <![CDATA[
4    All parameters in a functions signature should be used within the function.
5    ]]>
6    </standard>
7    <code_comparison>
8        <code title="Valid: All the parameters are used.">
9        <![CDATA[
10function addThree($a, $b, $c)
11{
12    return <em>$a + $b + $c</em>;
13}
14        ]]>
15        </code>
16        <code title="Invalid: One of the parameters is not being used.">
17        <![CDATA[
18function addThree($a, $b, $c)
19{
20    return <em>$a + $b</em>;
21}
22        ]]>
23        </code>
24    </code_comparison>
25</documentation>
26