Sum Two Numbers

/* Write a PHP script SumTwoNumbers.php that decleares two variables, firstNumber and secondNumber.
They should hold integer or floating-point numbers (hard-coded values). The numbers should be rounded to
the second number after the decimal point. */

<?php
function getSumOfTwoNumbers($firstNumber, $secondNumber) {
    echo '<p>$firstNumber + $secondNumber = ';
    echo $firstNumber . ' + ' . $secondNumber . ' = ';
    printf("%.02lf</p>\n", round(($firstNumber + $secondNumber), 2));
}

getSumOfTwoNumbers(2, 5);
getSumOfTwoNumbers(1.567808, 0.356);
getSumOfTwoNumbers(1234.5678, 333);
getSumOfTwoNumbers(-1.2345678, 1.2345678);
?>