<h2 id="parameterlist">Parameters</h2>
        <dl class="styled">
          <dt><code>$input</code>
                —
                array</dt>
          <dd>Reference to an array<br/><br/><br/>      </dd>
          <dt><code>$keys</code>
                —
                array</dt>
          <dd>The keys of the multidimensional array in order of<br/>appearance. e.g. `['key1','key2']` checks<br/>                                  `$arr['key1']['key2']`</dd>
        </dl>
        <h2 id="return">Returns