Am I expecting number_format to do something it is not meant to do?

Question

I have a float: 9.174599999999995

Which when I run number_format(9.174599999999995, 2) I am getting 9.17. I believe I should be getting 9.18 as the 4 rounds up to 5 and then the 7 rounds to 8. Is this not right? How can I achieve the desired result of 9.18?

No its not. Any number less than 5 will round down to 0 which is why you get 17 and not 18. — Jorge Campos, Oct 18 '15 at 19:48
http://stackoverflow.com/questions/3833137/how-to-make-number-format-not-to-round-numbers-up — Martin, Oct 18 '15 at 19:50

score 0 · Answer 1 · answered Oct 18 '15 at 19:50

0

This is because number_format doesn't round : http://php.net/manual/en/function.number-format.php

Take a look at round function : http://php.net/manual/fr/function.round.php

answered Oct 18 '15 at 19:50

Dan Chaltiel

7,811
5
47
92

score 0 · Answer 2 · answered Oct 18 '15 at 19:53

Well, you assume wrong, the correct answer is 9.17, because the rounding is made based on just one digit after the rounding point. Basically when you round 9.174599999999995 with 2 decimals, you round it based on 4, which is smaller than 5, so the number is rounded to 9.17

score 0 · Answer 3 · answered Oct 18 '15 at 19:58

0

due to case you can use php round. Examples:

$n=3.18925

$round=round($round, 1);

it will be displayed 3.2

$round=round($round, 2);

it will be displayed 3.19

answered Oct 18 '15 at 19:58

Rashad

1,344
2
17
33

score 0 · Answer 4 · answered Oct 18 '15 at 20:13

For your number,

$number = 9.17499999999995 ;
echo $english_format_number = number_format($number, 2, '.', '');
9.17

$number = 9.17599999999995 ;
echo $english_format_number = number_format($number, 2, '.', '');
9.18

and by using number_format for 2 times you can achieve desire result

$number = 9.17499999999995 ;
echo $number = number_format($number, 3, '.', '');
echo "<br>";
echo $english_format_number = number_format($number, 2, '.', '');  

RESULTS    
    9.175
    9.18

Am I expecting number_format to do something it is not meant to do?

4 Answers4