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);
?>

• A. Romeu: Just an overall comment, but calling a function 'getNumber' when it returns a string may not be the best solution to your problem
• 200_success: What you may and may not do after receiving answers. I've rolled back Rev 2 → 1.
• Chilion: Allright, won't do it again! Tnx :-)

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.