Set</span><span>(</span><span class="phpdocumentor-signature__argument"><span class="phpdocumentor-signature__argument__return-type">int|null&nbsp;</span><span class="phpdocumentor-signature__argument__name">$offset</span></span><span class="phpdocumentor-signature__argument"><span>, </span><span class="phpdocumentor-signature__argument__return-type">mixed&nbsp;</span><span class="phpdocumentor-signature__argument__name">$value</span></span><span>)</span><span> : </span><span class="phpdocumentor-signature_