Description:
------------
json_encode() output numbers formated according the to locales instead of standard format.

For example, in french coma is used for separate decimals. (like 1,5)
But in json:
- numbers must use a point for separate decimals (like 1.5)
- coma is used as field separator. (like "a","b")

So the result is not correct.

This bug is related with Bug #40360 ('current locale affects how json_encode encodes floats') witch is closed.

Reproduce code:
---------------
<?php

if (setlocale(LC_ALL,"fr_FR.UTF-8") != "fr_FR.UTF-8")
{
	die("Could not change the locale!");
}

$foo = Array(100.10,"bar");
echo json_encode($foo);

Class bar {}
$bar1 = new bar;
$bar1->a = 100.10;
$bar1->b = "foo";
echo json_encode($bar1);

?>

Expected result:
----------------
[100.1,"bar"]{"a":100.1,"b":"foo"}

Actual result:
--------------
[100,1,"bar"] // 2 fields => 3 fields 
{"a":100,1,"b":"foo"} // the output couldn't be evaluated