lass="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">array&lt;string|int, array&lt;string|int, mixed&gt;&gt;&nbsp;</span><span class="phpdocumentor-signature__argument__name">$headers</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">float&nbsp;</span><span class="phpdocumentor-signature__argument__reference-operator">&amp;</span><span class="phpdocumentor-signature__argume