yii中接收微信传过来的json数据

//控制器
<?php
namespace  frontend\controllers;
use frontend\models\User;
use yii;
use yii\web\Controller;
class ContController extends Controller
{
    public $enableCsrfValidation = false;
    //用户注册
    public function actionUser()
    {
        //接收json数据
        $a=file_get_contents("php://input");
        $aa=json_decode($a,true);
        $last=User::add($aa);
        if($last)
        {
            return "添加成功";
        }
        else
        {
            return "添加失败";
        }
    }
}

//模型层
<?php
namespace frontend\models;
use yii;
use yii\base\Model;
class User extends Model
{
    //用户添加
    public static function add(array &$data)
    {
      //  return $data['name'];
        $a=Yii::$app->db->createCommand()->insert('user', [
            'name' => $data['name'],
            'age' => $data['age'],
            'se' => $data['se'],
            'email' => $data['email'],
            'tell' => $data['tell'],
            'pwd' => $data['pwd'],
        ])->execute();
        if($a)
        {
            return true;
        }else{
            return false;
        }
    }
}