PHP は対称暗号化と復号化を実装します

/**
* 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编码
 * @param type $data
 * @return type
 */
function encode($data) {
 return str_replace(array('+', '/', '='), array('-', '_', ''), base64_encode(serialize($data)));
}
/**
* 安全URL解码
* @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)));
}

/**
* 简单对称加密
* @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(&#39;=&#39;, &#39;+&#39;, &#39;/&#39;), array(&#39;O0O0O&#39;, &#39;o000o&#39;, &#39;oo00o&#39;), join(&#39;&#39;, $strArr));
}