Write a program to print x to the power of n in php ?

echo "Print x power of n......";
function power($x,$n)
{

    if ($x==0)
    {
        return 0;

    }
    else if($n==0)
    {
        return 1;

    }
    else if ($n>0)
    {
        return( $x* power($x,$n-1));
    }
    else
    {
        return ((1/$x)*power($x,$n+1));
    }
}

echo pow(2,5);

?>