Description:
------------
Please try:
echo intval(8.2*1000);
echo intval(8.2*100);
echo intval(8.2*10);
echo intval(8.2*1);

result:
8200
819   <--- this is wrong!
82
8

happens in PHP 7.2 as well as in PHP 5.X

If 819 is the result of an internal representation of 8.2 as 8.199999..., than why does the first operation in this example not give 8199 ?!?

Expected result:
----------------
8.2*100 should give 820, not 819