<documentation title="Unnecessary String Concatenation">
    <standard>
    <![CDATA[
    Strings should not be concatenated together.
    ]]>
    </standard>
    <code_comparison>
        <code title="Valid: A string can be concatenated with an expression.">
        <![CDATA[
echo '5 + 2 = ' . (5 + 2);
        ]]>
        </code>
        <code title="Invalid: Strings should not be concatenated together.">
        <![CDATA[
echo 'Hello' . ' ' . 'World';
        ]]>
        </code>
    </code_comparison>
</documentation>