TEST

    test{"a":1,"s":2,"d":7,"2":{"a":3,"s":4}}Array ( [a] => 1 [s] => 2 [d] => 7 [2] => Array ( [a] => 3 [s] => 4 ) )

Array
(
    [d] => 7
)

Array ( [a] => 1 [s] => 2 [d] => 7 [2] => Array ( [a] => 3 [s] => 4 ) )