"phpdocumentor-signature__visibility">private</span>
                    <span class="phpdocumentor-signature__name">setIfExists</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span class="phpdocumentor-signature__argument__name">$variableName</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">array&lt;string|int, mixed&gt;