What is the function in PHP that can be used to find the maximum value in a set of numbers?

To find the maximum value in a set of numbers in PHP, you can use the `max()` function. This function takes an array of numbers as its argument and returns the highest value in the array. You can simply pass your set of numbers as an array to the `max()` function to get the maximum value.

$numbers = [10, 5, 8, 15, 3];
$maxValue = max($numbers);

echo "The maximum value is: " . $maxValue;