Why do I get a large remainder when adding numbers?

Question

PHP

Hello. There is such an array:

we are talking about php.

When adding this array, I get 203959.97999999998
I added it through array_sum and with this crutch:

foreach ($qqq as $value) {
  $qsum = $qsum + $value;
}
echo "$qsum";

(I just didn't know about array_sum)

In both cases the result is the same. Where does this residue come from?

Answer 1

floating point numbers are not guaranteed to be accurate.
https://www.php.net/manual/ru/language.types.float.php