如何在json中获取数组的值

Question

您好我是codeigniter的新手。我正在使用codeIgniter构建一个Web服务。我有一个json格式，如下所示

        {

        "pk_mobilenumber": 9711954265,
        "first_name": "utpal",
        "last_name":"sharma",
        "password":"Spaneos",
        "email_address":"utpalsharma@spaneos.com",
        "address":[
    {
        "area": "abc",
        "zipcode": "12344"
 }
    ]
        }

我想分别获取地址数组的值。我有剩余的值，因为它是一个post方法。我的下面的post方法给了我除地址数组以外的所有值，请帮我获取地址数组值。

function addUser_post(){
        $pk_mobilenumber = $this->post('pk_mobilenumber');
        $first_name = $this->post('first_name');
        $last_name = $this->post('last_name');
        $password = $this->post('password');

        //$city = $this->address->post('city');
        $address[] = $this->post('address');
        $area=$this->post("address['area']");
        //$zipcode=$this->post('zipcode');
        //$country=$this->address->post('country');
        $email_address = $this->post('email_address');

        //$data = json_decode($address);

        //echo $address;
        //echo $data['area'];
        //echo $zipcode;

        //$address = $this->post('address',"[]");

    //  $address1 = explode(",", $address);

        //echo $address1;

        echo $area;
        //echo $zipcode;

        $this->load->model('register_model');
        //echo "register";
        $data = $this->register_model->addUser($pk_mobilenumber,$first_name,$last_name,$password,$email_address);

        if($data){
        $this->response("Registration is successful", 201);
        }else{
            $this->response("User already exists. Please try with different Mobile number", 400);
        }

    }