/**
* 加密
* @var string [要加密的值]
*/
$secretKey = "wwj";
$data = $res['u_id'];
$encryptedData = Yii::$app->getSecurity()->encryptByPassword($data, $secretKey);

/**
* 解密
* @var [type] [加密前的值]
*/
$aid = $req->get('uid');
$secretKey = "wwj";
$uid = Yii::$app->getSecurity()->decryptByPassword($aid,$secretKey);

/**
 * 安全URL編碼
 * @param type $data
 * @return type
 */
function encode($data) {
 return str_replace(array('+', '/', '='), array('-', '_', ''), base64_encode(serialize($data)));
}
/**
* 安全URL解碼
* @param type $string
* @return type
*/
function decode($string) {
 $data = str_replace(array('-', '_'), array('+', '/'), $string);
 $mod4 = strlen($data) % 4;
 ($mod4) && $data .= substr('====', $mod4);
 return unserialize(base64_decode($data));
}

/**
* 加密
* @param [type] $code [description]
* @return [type]  [description]
*/
public static function encrypt($code)
{
 return urlencode(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5("key"), $code, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
}
/**
 * 解密
 * @param [type] $code [description]
 * @return [type]  [description]
 */
public static function decrypt($code)
{
 return urldecode(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5("key"), base64_decode($code), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)));
}

/**
* 簡單對稱加密
* @param string $string [需要加密的字符串]
* @param string $skey [加密的key]
* @return [type]   [加密后]
*/
function encode($string = '', $skey = 'cxphp')
{
  $strArr = str_split(base64_encode($string));
  $strCount = count($strArr);
  foreach (str_split($skey) as $key => $value)
  $key < $strCount && $strArr[$key].=$value;
  return str_replace(array('=', '+', '/'), array('O0O0O', 'o000o', 'oo00o'), join('', $strArr));
}

/**
* 簡單對稱解密
* @param string $string [加密后的值]
* @param string $skey [加密的key]
* @return [type]   [加密前的字符串]
*/
function decode($string = '', $skey = 'cxphp')
{
  $strArr = str_split(str_replace(array('O0O0O', 'o000o', 'oo00o'), array('=', '+', '/'), $string), 2);
  $strCount = count($strArr);
  foreach (str_split($skey) as $key => $value)
   $key <= $strCount && isset($strArr[$key]) && $strArr[$key][1] === $value && $strArr[$key] = $strArr[$key][0];
  return base64_decode(join('', $strArr));
}