PHP program to demonstrate the use of variable arguments

<?php
//php program to demonstrate the 
//use of variable arguments.
function Sum(...$values)
{
    $res = 0;
    foreach ($values as $val)
    {
        $res = $res + $val;
    }
    return $res;
}

$sum = Sum(10, 20);
echo "Sum: " . $sum . "<br>";

$sum = Sum(10, 20, 30);
echo "Sum: " . $sum . "<br>";
?>

Output
Sum: 30
Sum: 60