CODEWITHSUNDEEP
phpjsonfloating-pointprecision
Marco
Marco

Reputation: 108

Representation of small float numbers in json_encode

I'm executing the following code in a PHP script:

$obj = new \stdClass();
$obj->lat = 0.000011399388312455;
echo json_encode($obj) . "\n";

The output of the script is

{"lat":1.1399388312454999446e-5}

As you can see, the number is represented in exponential notation. Is there some way to represent that particular number in extended notation, in the JSON-serialized object?

The desired output is

{"lat":0.000011399388312455}

The version of PHP is 5.6.30.

P.S.: This JSON-serialized object will be sent to an external web service that doesn't accept numbers in exponential form. Moreover, it needs to be a number and not a string ({"lat":"0.000011399388312455"} won't work).

The number should not be rounded (it's a geographical coordinate).

Here are other similar questions, but they don't fit my case unfortunately.

php- floating point number shown in exponential form

Remove the "E" in a number format for very small numbers

Thank you in advance.

Upvotes: 3

Views: 567

Answers (1)

antoha.by
antoha.by

Reputation: 131

It is implemented in PHP 7.1 https://wiki.php.net/rfc/precise_float_value As a work around, use other JSON serializers not a default json_encode.

E notation is valid form of float representation. In php >7.1 with precision set to -1 results of your code would look like: {"lat":1.1399388312455e-5} which is absolutely the same as 0.000011399388312455 because you have 4 leading zeros.

If you still want to have leading zeroes in json i would go towards strings. They are perfectly fine for coordinates representations.

Upvotes: 3

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