php variable length argument function

PHP supports variable length argument function. It means you can pass 0, 1 or n number of arguments in function. To do so, you need to use 3 ellipses (dots) before the argument name.

The 3 dot concept is implemented for variable length argument since PHP 5.6.

Let's see a simple example of PHP variable length argument function.

<?php  

function add(...$numbers) {  

    $sum = 0;  

    foreach ($numbers as $n) {  

        $sum += $n;  

    }  

    return $sum;  

}  

echo add(1, 2, 3, 4);  

?>