How can I make radical function in php? - php

Question

I was trying to make function that gives two value. First value was the respite in the radical and the second value is the number that we want to put it in radical.
It's my code:
function radical($respite = 2, $num)
{
$numbers = array();
for ($i = 1; $i < 10; $i++) {
$numbers[] = '0.' . "$i";
}
for ($i = 1; $i < 10; $i++) {
$numbers[] = '1.' . "$i";
}
// I wanted do these loop until to creat numbers from 0.1 to 100,
// but i under stand it's silly work and wrong.
for ($i = 0; $i < sizeof($numbers); $i++) {
if ($respite == 2) {
$hesan = $number["$i"] * $number["$i"];
if ($hesab == $num) {
return $hesab;
}
} elseif ($respite == 3) {
$hesan = $number["$i"] * $number["$i"] * $number["$i"];
if ($hesab == $num) {
return $hesab;
}
}
}
}
I tried to create numbers from 0.1 to 100. and I wanted write if $number[$i] * $number[$i] = $num return the $number, but I saw it's silly work and wrong my means create numbers from 0.1 to 100 by this way.
For radical(2, 9) the output should be 4, because 3 * 3 = 9.
If the first value is 3 radical(3, 8) the output should be 2, because 2 * 2 * 2= 8
Can someone make function to do radical with respite ? or improve my code ?

Answer 1

If you want to do this not as an exercise but for productive use, I suggest this:
function radical($num, $respite = 2)
{
return $num ** (1 / $respite);
}
echo radical(27, 3) . "\n" .
radical(8, 3) . "\n" .
radical(36, 2) . "\n" .
radical(16, 2);
Output:
3
2
6
4
You can see it here
The reason I changed the argument order is that you can't have a required parameter after an optional one.

Answer 2

Hope this is what you are looking for..
Try this code snippet here
function radical($respite = 2, $num)
{
for($x=0;$x<=10;$x+=0.1)
{
$numbers[]=$x;
}
for ($i = 0; $i < sizeof($numbers); $i++)
{
if ($respite == 2)
{
if ((string)($numbers[$i] * $numbers[$i]) == (string)$num)
{
return $numbers[$i];;
}
}
elseif ($respite == 3)
{
if ((string)($numbers[$i] * $numbers[$i]* $numbers[$i]) == (string)$num)
{
return $numbers[$i];
}
}
}
}
print_r(radical(3, 27));//3
print_r(radical(3, 8));//2
print_r(radical(2, 36));//6
print_r(radical(2, 16));//4

Answer 3

I'm not sure what you're going for exactly, but I think this cleans up what you have now at least:
function radical($num, $respite = 2) {
$numbers = array();
for ($i = 1; $i <= 1000; $i++) {
$numbers[] = $i * 0.1;
}
foreach($numbers as $i) {
if ($respite == 2) {
$hesab = $i * $i;
if ($hesab == $num) {
return $i;
}
}
elseif($respite == 3) {
$hesab = $i * $i * $i;
if ($hesab == $num) {
return $i;
}
}
}
return 0;
}