Question

How to write a recursive function that calculate power in PHP

Answer 1

printf("%d\n<br />", power(2, 3)); // 8
printf("%d\n<br />", power(2, 4)); // 16
printf("%d\n<br />", power(3, 2)); // 9
printf("%d\n<br />", power(3, 3)); // 27
printf("%d\n<br />", power(5, 4)); // 625
          
echo "<br />";
 
echo power(2, 3) . "<br />"; // 8
echo power(2, 4) . "<br />"; // 16
echo power(3, 2) . "<br />"; // 9
echo power(3, 3) . "<br />"; // 27
echo power(5, 4) . "<br />"; // 625
 
function power($x, $y)
{
    if ($y == 0)
        return 1;
    return $x * power($x, $y - 1);
}

    
/*
run:

8
16
9
27
625

8
16
9
27
625
     
*/

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