What is the good example of using 'func_get_arg' in PHP?

Question

I just have found out that there is a function called func_get_arg in PHP which enables developer to use variant style of getting arguments. It seems to be very us

Answer 1

First of all, you are using the term "polymorphism" totally wrong. Polymorphism is a concept in object-oriented programming, and it has nothing to do with variable number of arguments in functions.

In my experience, all func_get_args allows you to do is add a little syntactic sugar.

Think of a function that can take any number of integers and return their sum. (I 'm cheating, as this already exists in array_sum. But cheating is good if it keeps the example simple). You could do it this way:

// you can leave "array" out; I have it because we should be getting one here
function sum1(array $integers) {
    return array_sum($integers);
}

Now you would call this like so:

$sum = sum1(array(1));
$sum = sum1(array(1, 2, 3, 4));

This isn't very pretty. But we can do better:

function sum2() {
    $integers = func_get_args();
    return array_sum($integers);
}

Now you can call it like this:

$sum = sum2(1);
$sum = sum2(1, 2, 3, 4);