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写了一个用于解码获取unionid的Yii2的组件，比较乱，能用。

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/6/14
 * Time: 10:29
 * 解码获取微信unionID
 * 小程序端:
 * 1,wx.login 后获取code
 * 2 wx.getUserInfo({withCredentials:true})获得$encrptedData和$iv
 * 3 将$session_key $encrptedData $iv 传递到客户api服务器
 *
 * 客户api服务器端
 * 1 将本类设置为组件
 * 2 code换session_key
 *   https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code
 * 3 $wx = Yii::$app->WxBizDataCrypt
 *   $wx->setData($session_key $encrptedData $iv)
 *   $wx->decryptData()
 */
namespace backend\components\wx_decode;
 
use Yii;
use yii\base\Component;
use yii\base\Exception;
 
class WxBizDataCrypt extends Component
{
 
    public $appid = 'wxaxxxxxxxxxxxxxxxxxxx';
    //public $session_key;
    public $aesKey;
    public $aesIv;
    public $aesCipher;
 
 
    public static  $error_code = [
                                        'ok' => 0,
                            'IllegalAesKey' => -41001,
                                'IllegalIv' => -41002,
                            'IllegalBuffer' => -41003,
                        'DecodeBase64Error' => -41004
                        ];
 
 
    public function setData($session_key,$encryptedData,$iv){
        if (strlen($session_key) != 24) {
            return static::$error_code['IllegalAesKey'];
        }
        $this->aesKey = base64_decode($session_key);
        if (strlen($iv) != 24) {
            return static::$error_code['IllegalIv'];
        }
        $this->aesIv=base64_decode($iv);
        $this->aesCipher=base64_decode($encryptedData);
        return true;
    }
 
 
 
    public function decryptData()
    {
        //$pc = new Prpcrypt($aesKey);
        $result = $this->decrypt();
 
        if ($result[0] != 0) {
            return $result[0];
        }
 
        $dataObj=json_decode( $result[1] );
        if( $dataObj  == NULL )
        {
            return static::$error_code['IllegalBuffer'];
        }
        if( $dataObj->watermark->appid != $this->appid )
        {
            return static::$error_code['IllegalBuffer'];
        }
 
        return $result[1];
    }
 
    /**
     * 对密文进行解密
     * @param string $aesCipher 需要解密的密文
     * @param string $aesIV 解密的初始向量
     * @return string 解密得到的明文
     */
    public function decrypt()
    {
 
        try {
 
            $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
 
            mcrypt_generic_init($module, $this->aesKey, $this->aesIv);
 
            //解密
            $decrypted = mdecrypt_generic($module, $this->aesCipher);
            mcrypt_generic_deinit($module);
            mcrypt_module_close($module);
        } catch (Exception $e) {
            return array(static::$error_code['IllegalBuffer'], null);
        }
 
 
        try {
            //去除补位字符
            //$pkc_encoder = new PKCS7Encoder;
            $result = $this->decode($decrypted);
 
        } catch (Exception $e) {
            //print $e;
            return array(static::$error_code['IllegalBuffer'], null);
        }
        return array(0, $result);
    }
 
 
    /**
     * 对解密后的明文进行补位删除
     * @param decrypted 解密后的明文
     * @return 删除填充补位后的明文
     */
   public function decode($text)
    {
 
        $pad = ord(substr($text, -1));
        if ($pad < 1 || $pad > 32) {
            $pad = 0;
        }
        return substr($text, 0, (strlen($text) - $pad));
    }
}


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