我尝试`intval（6.02 * 100）`，结果是602，但为什么`intval（5.02 * 100）`的结果是501？ [重复]

Question

This question already has an answer here:

• Is floating point math broken? 30 answers

I try intval(6.02 * 100),the result is 602。but why the result of intval(5.02 * 100) is 501?

</div>

Answer 1

This is a floating point math issue. The following might help explain it:

ini_set('precision', 17);
echo (float)5.02;

5.0199999999999996

echo 5.02 * 100;

501.99999999999994

echo intval(501.99999999999994);

501

More discussion on this topic: php intval() and floor() return value that is too low?