Function not working as expected in PHP

Question

What is wrong with the output of this function, it prints out INF int the browser where as I expected it to print out 654321 The exact same function written in C# print out the expected result.

<?php
        function reverse($n, $r){
            if($n == 0) {
                return $r;
            }
            return reverse($n/10, $r*10 + $n%10);
        }

        echo reverse(123456, 0);
?>

Answer 1

尝试strrev()函数：

strrev('123456'); //654321

Answer 2

It does not do integer division. In C# you deal with strict typing, and when you divide 25 by 4 in C# you will get integer result, 6. In php you will get 6.25, float result.

Try intval your results before recursion to get integer division