Loop through json object in php.

while($row=mysql_fetch_array($result)){
   $posts = json_decode($row['value'],true);
   array_push($response,$posts);
  }
   //print_r($response);
   foreach($response as $value){
         //$plus +=1;
         $plus = $plus+$value['quantity'];
   }

Array
(
    [0] => Array
        (
            [0] => Array
                (
                    [srno] => 1
                    [name] => Gaspari Aminolast
                    [quantity] => 2
                    [price] => 2920.0000
                    [total_bill] => 5840
                )

            [1] => Array
                (
                    [srno] => 2
                    [name] => Gaspari Amino Max
                    [quantity] => 2
                    [price] => 2640.0000
                    [total_bill] => 5280
                )

            [2] => Array
                (
                    [srno] => 3
                    [name] => Myofusion 10Lbs
                    [quantity] => 2
                    [price] => 8400.0000
                    [total_bill] => 16800
                )

        )

    [1] => Array
        (
            [0] => Array
                (
                    [srno] => 1
                    [name] => Gaspari Aminolast
                    [quantity] => 2
                    [price] => 2920.0000
                    [total_bill] => 5840
                )

            [1] => Array
                (
                    [srno] => 2
                    [name] => Gaspari Amino Max
                    [quantity] => 2
                    [price] => 2640.0000
                    [total_bill] => 5280
                )

            [2] => Array
                (
                    [srno] => 3
                    [name] => Myofusion 10Lbs
                    [quantity] => 2
                    [price] => 8400.0000
                    [total_bill] => 16800
                )

        )

    [2] => Array
        (
            [0] => Array
                (
                    [srno] => 1
                    [name] => Gaspari Aminolast
                    [quantity] => 2
                    [price] => 2920.0000
                    [total_bill] => 5840
                )

            [1] => Array
                (
                    [srno] => 2
                    [name] => Gaspari Amino Max
                    [quantity] => 2
                    [price] => 2640.0000
                    [total_bill] => 5280
                )

        )

    [3] => Array
        (
            [0] => Array
                (
                    [srno] => 1
                    [name] => Gaspari Aminolast
                    [quantity] => 2
                    [price] => 2920.0000
                    [total_bill] => 5840
                )

            [1] => Array
                (
                    [srno] => 2
                    [name] => Gaspari Amino Max
                    [quantity] => 2
                    [price] => 2640.0000
                    [total_bill] => 5280
                )

        )

    [4] => Array
        (
        )

    [5] => Array
        (
        )

    [6] => Array
        (
            [0] => Array
                (
                    [srno] => 1
                    [name] => Gaspari Amino Max
                    [quantity] => 2
                    [price] => 2640.0000
                    [total_bill] => 5280
                )

            [1] => Array
                (
                    [srno] => 2
                    [name] => Gaspari Aminolast
                    [quantity] => 2
                    [price] => 2920.0000
                    [total_bill] => 5840
                )

        )

)