&lt;?php  <br />
    function add(...$numbers) {  <br />
        $sum = 0;  <br />
        foreach ($numbers as $n) {  <br />
            $sum += $n;  <br />
        }  <br />
        return $sum;  <br />
    }  <br />
      <br />
    echo add(1, 2, 3, 4, 5, 6) . &quot;
&quot;;  <br />
    ?&gt;