Description:
------------
---
From manual page: http://www.php.net/function.json-decode#refsect1-function.json-
decode-examples
---
Example #5 from the documentation doesn't work, where the fourth argument is 
given.

Test script:
---------------
<?php
$json = '12345678901234567890';

var_dump(json_decode($json));
var_dump(json_decode($json, false, 512, JSON_BIGINT_AS_STRING));

?>

Expected result:
----------------
float(1.2345678901235E+19)
string(20) "12345678901234567890"

Actual result:
--------------
ErrorException [ Warning ]: json_decode() expects at most 3 parameters, 4 given