Description:
------------
An HTTP GET request in array form with equal sign gives an unexpected result.



Test script:
---------------
//Http Request
#index.php?query1[=]=1

print_r($_GET);
//or
print_r(filter_input_array(INPUT_GET));

Expected result:
----------------
Array
(
    [query1] => Array
        (
            [=] => 1
        )

)

Actual result:
--------------
Array
(
    [query1_] => ]=1
)