Get number from N

Question

I'm trying to find the shortest and best way to achieve the following:

Given input integer $N, get the following output:

• n = 0, output = 0
• n = 1, output = 0
• n = 2, output = 10
• n = 3, output = 100
• n = 4, output = 1000
• n = 5, output = 10000

I do this with the following code, but there must be a better option to do this.

<?php

    $n = 1;

    function getNumber($n) {
        if ($n === 0 OR $n === 1) {
            return "0";
        } else {
            return "1".str_repeat("0", $n -1);
        }
    }

    echo getNumber($n);
?>

Answer 1

Maybe you want something short like is

echo ($n <= 1) ? 0 : pow(10, $n - 1);

Answer 2

The pow function is probably what you are looking for.

return pow(10, $n-1); should be close to what you want but might need tweeking for borderline cases.