json_encode retain float values as is it is

Question

I need to convert an array to json and want to retain the precision as well as type of the data.

   $a = array("num" => 10000.00);
   print_r(json_encode($a));

In the above example 10000.00 is being converted to 10000. How can I retain everything in the json.

there's no way retaining the decimal numbers without converting that to string — Beginner, Dec 23 '16 at 09:26

score 10 · Answer 1 · edited May 23 '17 at 12:00

10

The best you can do in php 5.6+, is to make sure it is encoded as a float. However, that does not keep the precision:

<?php
$a = array("num" => 10000.00);
print_r(json_encode($a, JSON_PRESERVE_ZERO_FRACTION));

If datatype and precision are important, you would need to send an additional parameter, for example:

$a = ["num" => [
        "value" => 10000.0, 
        "precision" => 2
    ]
];
print_r(json_encode($a, JSON_PRESERVE_ZERO_FRACTION));

If you always want the precision of 2 digits (like monetary values), you should multiply the values by 100 and store these as integers to avoid rounding problems. Also see PHP - Floating Number Precision.

edited May 23 '17 at 12:00

Community

1
1

answered Dec 23 '16 at 09:20

jeroen

91,079
21
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Is it impossible to keep precision in that case? – Harshit Dec 23 '16 at 09:23
@Harshit Unless you specify it (see my edit), the precision is unkown to php. – jeroen Dec 23 '16 at 09:24
@jereon Actually I need it for some payment API which only accepts a floating point with a 2 decimal precision. – Harshit Dec 23 '16 at 09:35
This is great as it'll keep float as float, however it will convert integers to float – Harry Dec 11 '17 at 16:22

score -1 · Answer 2 · answered Dec 23 '16 at 09:25

-1

You can use the below code segment to get your desired output -

$a = array("num" => 10000.00);
foreach ($a as $i => $number) 
 {
    $a[$i] = number_format($number, 2, '.', null);
 }

  echo $res = json_encode($a);

answered Dec 23 '16 at 09:25

Rahul Khandelwal Systematix

141
10

1

That's a lot of code for simply casting the value to a string ;-) – jeroen Dec 23 '16 at 09:26

json_encode retain float values as is it is

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