Some functions have a special feature: they accept a variable number of arguments. This isn't related to default values, as it was with round(). The point is that the amount of data passed isn't limited to a fixed number.

Let's look at the max() function. It finds the largest value among the passed data.

<?php

print_r(max(1, 10, 3)); // => 10
print_r(max(1, -3, 2, 3, 2)); // => 3

Let's open the documentation and look at the signature of max():

max(mixed $value, mixed ...$values): mixed

This means:

• the function requires at least one value ($value);
• after that you can pass any number of additional values (...$values) — a variable number of arguments is denoted by the ellipsis ...;
• the function will return the largest of those passed.

The mixed type in the signature means "any type": the function can compare not only numbers, but other values as well.

If there are several identical maximum values among the arguments, the first of them is returned.

<?php

print_r(max(5, 5, 2)); // => 5

The min() function works in the same way, only it looks for the smallest value:

<?php

print_r(min(1, 10, 3)); // => 1
print_r(min(1, -3, 2, 3, 2)); // => -3

Over the course of a week, the following air temperatures were recorded: 3, 10, 22, -3, 0 degrees. Find the minimum value using the min() function and print it to the screen.