forcing 4 decimal places on a number without changing it's type to string-CodePudding

i receive some data including a decimal number from an api in post request with content-type:json

among the posted data , is a Amount parameters with 4 decimal places

{
  "Amount": 500.0000  ,
  "param1" : "value1" ,
  "param2" : "value2" 
}

after parsing the json

$data = json_decode(file_get_contents('php://input'), true);
var_dump($data);

here is my output

array(3) {
  ["Amount"]=>
  float(500)
  ["param1"]=>
  string(6) "value1"
  ["param2"]=>
  string(6) "value2"
}

the problem is im losing the decimal places on the Amount if they are zero

so instead of 500.0000 i get 500 , i know they are the same numbers mathematically but i need to generate a hash from these posted parameters which requires me to have Amount as a float number with 4 decimal places exactly as posted in the first place

i can do something like

$data['Amount'] = sprintf('%0.4f',   $data['Amount'] );

but than it would convert the Amount into an string , which results in a invalid hash

array(3) {
  ["Amount"]=>
  string(8) "500.0000"
  ["param1"]=>
  string(6) "value1"
  ["param2"]=>
  string(6) "value2"
}

i need my $data output to be

  ["Amount"]=>
  float(500.0000)

tried to run it throw floatval , lost the decimal zeros again ! im losing my mind over something so simple , any idea how to solve this ?

CodePudding user response：

In C#, you can do this with the decimal type instead of double or float. While my PHP knowledge is limited, it looks like the PHP world has something similar in BC Math and PHP Decimal.

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/floating-point-numeric-types https://www.php.net/manual/en/book.bc.php https://php-decimal.io/

CodePudding user response：

Use built-in number_format function.

https://www.w3schools.com/php/func_string_number_format.asp