PHP float modulus not working

Question

I wrote a function to add commas and zeros to a number if necessary, but I've gotten stuck at the modulus function. According to my PHP:

float(877.5) % 1 == 0 //true

Shouldn't 877.5 % 1 == 0.5?

`Operands of modulo are converted to integers (by stripping the decimal part) before processing. For floating-point modulo, see fmod(). ` [reference](http://php.net/manual/en/language.operators.arithmetic.php) . thanks for asking — Accountant م, Aug 27 '17 at 19:18

score 22 · Accepted Answer · answered Apr 23 '14 at 06:53

22

It's giving you the reminder of the division what you need is fmod,

fmod — Returns the floating point remainder (modulo) of the division of the arguments

echo fmod(877.5, 1); // 0.5

answered Apr 23 '14 at 06:53

Rikesh

3

So what's the difference between % and fmod exactly? Is it because it's a float that % does not work? – Liftoff Apr 23 '14 at 07:01
Odd, in google chrome inspector, if I type 33.3 % 1 it gives me the float return of 0.3 – Shannon Hochkins Mar 23 '15 at 21:24
@ShannonHochkins - Calculations in Web Consoles are powered by JavaScript, not PHP. If you run `(9.5 % 6)` through JavaScript and PHP, JavaScript will give the answer `3.5` and PHP will give the answer `3`. If you want `3.5` from PHP, you need to ask it: `fmod(9.5, 6)` – Rounin Jul 01 '22 at 14:39

score 1 · Answer 2 · answered Apr 23 '14 at 06:51

1

No, the modulus operator tells you the remainder of the division. Anything divided by 1 does not have a remainder, so it yields 0.

answered Apr 23 '14 at 06:51

Sterling Archer

2 Answers2