PHP floating-point number comparison is not equal to the problem

First, the problem is this.

$x= 8-6.4;//which is equal to 1.6$y= 1.6;Var_dump($x===$y);//is not trueEcho"<br>";Var_dump(Floatval($x) ==Floatval($y));Echo"<br>";Echo Floatval($x) . "<br>";Echo Floatval($y) . "<br>";Exit();

In fact, because the $x variable in the subtraction operation after the fractional precision and $y inconsistency caused by

Check out the official PHP instructions

Link Address: http://php.net/manual/zh/language.types.float.php

PHP floating-point number comparison is not equal to the problem