">Builder</abbr></a>&nbsp;</span><span class="phpdocumentor-signature__argument__name">$builder</span></span><span class="phpdocumentor-signature__argument"><span>[</span><span>, </span><span class="phpdocumentor-signature__argument__return-type">string&nbsp;</span><span class="phpdocumentor-signature__argument__name">$pool</span><span> = </span><span class="phpdocumentor-signature__argument__default-value">&#039;&#039;</span><span> ]</span></span><span>)</span><span> : </span><span class="phpdocumentor-sig