class Jwt {
 
 //頭部
 private static $header=array(
  'alg'=>'HS256', //生成signature的算法
  'typ'=>'JWT' //類型
 );
 
 //使用HMAC生成信息摘要時(shí)所使用的密鑰
 private static $key='123456';
 
 
 /**
  * 獲取jwt token
  * @param array $payload jwt載荷 格式如下非必須
  * [
  * 'iss'=>'jwt_admin', //該JWT的簽發(fā)者
  * 'iat'=>time(), //簽發(fā)時(shí)間
  * 'exp'=>time()+7200, //過(guò)期時(shí)間
  * 'nbf'=>time()+60, //該時(shí)間之前不接收處理該Token
  * 'sub'=>'www.admin.com', //面向的用戶
  * 'jti'=>md5(uniqid('JWT').time()) //該Token唯一標(biāo)識(shí)
  * ]
  * @return bool|string
  */
 public static function getToken($payload)
 {
  if(is_array($payload))
  {
   $base64header=self::base64UrlEncode(json_encode(self::$header,JSON_UNESCAPED_UNICODE));
   $base64payload=self::base64UrlEncode(json_encode($payload,JSON_UNESCAPED_UNICODE));
   $token=$base64header.'.'.$base64payload.'.'.self::signature($base64header.'.'.$base64payload,self::$key,self::$header['alg']);
   return $token;
  }else{
   return false;
  }
 }
 
 
 /**
  * 驗(yàn)證token是否有效,默認(rèn)驗(yàn)證exp,nbf,iat時(shí)間
  * @param string $Token 需要驗(yàn)證的token
  * @return bool|string
  */
 public static function verifyToken($Token)
 {
  $tokens = explode('.', $Token);
  if (count($tokens) != 3)
   return false;
 
  list($base64header, $base64payload, $sign) = $tokens;
 
  //獲取jwt算法
  $base64decodeheader = json_decode(self::base64UrlDecode($base64header), JSON_OBJECT_AS_ARRAY);
  if (empty($base64decodeheader['alg']))
   return false;
 
  //簽名驗(yàn)證
  if (self::signature($base64header . '.' . $base64payload, self::$key, $base64decodeheader['alg']) !== $sign)
   return false;
 
  $payload = json_decode(self::base64UrlDecode($base64payload), JSON_OBJECT_AS_ARRAY);
 
  //簽發(fā)時(shí)間大于當(dāng)前服務(wù)器時(shí)間驗(yàn)證失敗
  if (isset($payload['iat']) && $payload['iat'] > time())
   return false;
 
  //過(guò)期時(shí)間小宇當(dāng)前服務(wù)器時(shí)間驗(yàn)證失敗
  if (isset($payload['exp']) && $payload['exp'] < time())
   return false;
 
  //該nbf時(shí)間之前不接收處理該Token
  if (isset($payload['nbf']) && $payload['nbf'] > time())
   return false;
 
  return $payload;
 }
 
 
 
 
 /**
  * base64UrlEncode https://jwt.io/ 中base64UrlEncode編碼實(shí)現(xiàn)
  * @param string $input 需要編碼的字符串
  * @return string
  */
 private static function base64UrlEncode($input)
 {
  return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
 }
 
 /**
  * base64UrlEncode https://jwt.io/ 中base64UrlEncode解碼實(shí)現(xiàn)
  * @param string $input 需要解碼的字符串
  * @return bool|string
  */
 private static function base64UrlDecode($input)
 {
  $remainder = strlen($input) % 4;
  if ($remainder) {
   $addlen = 4 - $remainder;
   $input .= str_repeat('=', $addlen);
  }
  return base64_decode(strtr($input, '-_', '+/'));
 }
 
 /**
  * HMACSHA256簽名 https://jwt.io/ 中HMACSHA256簽名實(shí)現(xiàn)
  * @param string $input 為base64UrlEncode(header).".".base64UrlEncode(payload)
  * @param string $key
  * @param string $alg 算法方式
  * @return mixed
  */
 private static function signature($input, $key, $alg = 'HS256')
 {
  $alg_config=array(
   'HS256'=>'sha256'
  );
  return self::base64UrlEncode(hash_hmac($alg_config[$alg], $input, $key,true));
 }
}

public function makeToken(){
	 $uname=$this->uname;	$currtime=time();
	 if(empty($this->uname)){ echo json_encode(array('code'=>-1,'msg'=>'[主賬號(hào)]參數(shù)為空'),JSON_UNESCAPED_UNICODE);	exit(); }	
	 ....
	 //jwt驗(yàn)證
	 vendor("Jwt.Jwt");
	 $jwt = new \Jwt();
//這里構(gòu)造jwt參數(shù)，可以參照jwt規(guī)范，各字段可以自行定義內(nèi)容	 $payload=array('iss'=>'xesport','sub'=>'xxx_player','name'=>$playerName,'iat'=>$currtime,'jti'=>md5(uniqid('JWT').$currtime));
	 $token=$jwt->getToken($payload); $this->token=$token;
	 $url='http://xxx?token='.$token;
	 $data=array('url'=>$url);
	 
	 echo json_encode(array('code'=>1,'data'=>$data,),JSON_UNESCAPED_UNICODE); exit();
 
	}

//驗(yàn)證token
public function verifyToken(){
	 $token=$_REQUEST['token'];
	 if(empty($token)){ echo json_encode(array('code'=>-1,'msg'=>'[token]參數(shù)為空!'),JSON_UNESCAPED_UNICODE);	exit(); }
  vendor("Jwt.Jwt");
	 $jwt = new \Jwt();	 
	 $res_token=$jwt->verifyToken($token);
  //var_dump('res_token==',$res_token);
	 if(empty($res_token)){ echo json_encode(array('code'=>-2,'msg'=>'[token]驗(yàn)證失敗!'),JSON_UNESCAPED_UNICODE);	exit(); }
	 $playerName=$res_token['name'];
	 //echo $playerName; die;
	 這里可以寫從數(shù)據(jù)庫(kù)查詢驗(yàn)證user是否存在，返回 $userInfo 
	 if(empty($userInfo)){ echo json_encode(array('code'=>-3,'msg'=>'[token]驗(yàn)證用戶無(wú)效!'),JSON_UNESCAPED_UNICODE);	exit(); }
	 $data=array('username'=>$playerName);
	 echo json_encode(array('code'=>1,'data'=>$data,'msg'=>'[token]驗(yàn)證成功'),JSON_UNESCAPED_UNICODE);	exit();
	}