How to split float in PHP?

Question

Let's say we have 12.054 and I want to split it to three variables like $whole_number=12 $numerator=54 and $denominator=1000. Could you help me?

You probably would never actually *have* such a number because 54/100 is not a sum of powers of two. So at best you could put in an arbitrary round-off and get some approximate answer. Or more simply put, if `$x = 1.0/3.0;`, do you want 33/100, 333/1000 or 3333/10000? — Kerrek SB, Jun 29 '11 at 10:13

Stefan Gehrig · Accepted Answer · 2011-06-29T10:43:08.107

7

A straight-forward approach - not very academic, but it works for PHP ;-):

$float        = 12.054;
$parts        = explode('.', (string)$float);
$whole_number = $parts[0];
$numerator    = trim($parts[1], '0');
$denominator  = pow(10, strlen(rtrim($parts[1], '0')));

Some more work might be needed to ensure that edge case work too (trailing 0s, no decimal part at all, etc.).

edited Jun 29 '11 at 10:43

answered Jun 29 '11 at 09:35

Stefan Gehrig

82,642
24
155
189

If you might reach the integer limit, then just remove the `(int)`-cast, which is not really necessary. `$whole_number` and `$numerator` will be strings then. – Stefan Gehrig Jun 29 '11 at 09:42
If I don't use int then $numerator will be 054, how could I remove those zero(s)? – Templar Jun 29 '11 at 10:37
Edited the example - now using `trim()` to remove training and leading `0`s from the `$numerator` – Stefan Gehrig Jun 29 '11 at 10:43
would it be possible to get from $float = 1/3 $numerator = 1 and $denominator = 3 (of coure not with this code) or no because of precision? – Templar Jun 30 '11 at 08:46

score 4 · Answer 2 · answered Jun 29 '11 at 09:39

Here is something to get you started , based on simple type conversions.

http://codepad.org/7ExBhTMS

However, there are many cases to consider like :

Preceding/trailing zeros. 12.0540 ( is 540/10000 or 54/1000 for you )

Handling decimals with no fractional part eg. 12.00 .

$val = 12.054;
print_r(splitter($val));

function splitter($val)
{
  $str = (string) $val ;
  $splitted = explode(".",$str);
  $whole = (integer)$splitted[0] ;
  $num = (integer) $splitted[1];
  $den = (integer)  pow(10,strlen($splitted[1]));
  return array('whole' => $whole, 'num' => $num,'den' => $den);
}



?>

score 2 · Answer 3 · answered Jun 29 '11 at 09:50

Try This

<?
$no = 12.54;
$arr = explode(".", $no);

$full_no = $arr[0].$arr[1];

for($i = 0; $i < strlen($arr[1]); $i++) $denominator = $denominator."0";

$denominator = "1".$denominator;

$numerator = $full_no % $denominator;

$whole_no = $full_no / $denominator;

echo "Denominator = ". $denominator ."<br>";

echo "Numerator = ". $numerator ."<br>";

echo "Whole No = ". (int)$whole_no ."<br>";
?>

Output :

Denominator = 100
Numerator = 54
Whole No = 12

Output for 12.054 :

Denominator = 1000
Numerator = 54
Whole No = 12

I hope this will help you..

How to split float in PHP?

3 Answers3