Description:
------------
---
From manual page: http://www.php.net/function.json-last-error#refsect1-
function.json-last-error-returnvalues
---
JSON_ERROR_RECURSION is missing from the list of constants in  json_last_error()


The constant seems to be defined as 6 in my PHP build (PHP 5.5.3-1) and the test 
script returns a value of 6.  

Test script:
---------------
$foo = new stdClass();
$bar = new stdClass();
$foo->bar = $bar;
$bar->foo = $foo; 
var_dump(json_encode($foo));
var_dump(json_last_error());

int(6)
Recursion detected

Expected result:
----------------
JSON_ERROR_RECURSION would be defined on http://www.php.net/function.json-last-
error