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Explain PHP variable length argument function

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);  
?>  
Output:
10