PHP Variable Length Argument Function PHP

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.

1. <?php  
2. function add(...$numbers) {  
3.     $sum = 0;  
4.     foreach ($numbers as $n) {  
5.         $sum += $n;  
6.     }  
7.     return $sum;  
8. }  
9.   
10. echo add(1, 2, 3, 4);  
11. ?>  

Output: