编写一个类，实现类似JWT功能

class JWT
{
    protected $secret;

    public function __construct($secret)
    {
        $this->secret = $secret;
    }

    public function encode($payload)
    {
        $header = [
            'typ' => 'JWT',
            'alg' => 'HS256'
        ];

        $header = base64_encode(json_encode($header));
        $payload = base64_encode(json_encode($payload));
        $signature = hash_hmac('sha256', "$header.$payload", $this->secret, true);
        $signature = base64_encode($signature);

        return "$header.$payload.$signature";
    }

    public function decode($token)
    {
        list($header, $payload, $signature) = explode('.', $token);
        $data = "$header.$payload";
        $hash = hash_hmac('sha256', $data, $this->secret, true);
        $hash = base64_encode($hash);

        if ($hash !== $signature) {
            throw new Exception('Invalid token signature');
        }

        $payload = json_decode(base64_decode($payload), true);

        if (!is_array($payload)) {
            throw new Exception('Invalid token payload');
        }

        return $payload;
    }
}

使用方式如下：

// 设置加密密钥
$secret = 'mysecretpassword';

// 创建 JWT 对象
$jwt = new JWT($secret);

// 要加密的信息
$payload = ['username' => 'Alice', 'email' => 'alice@example.com'];

// 加密信息
$encoded_payload = $jwt->encode($payload);

// 输出加密后的信息
echo $encoded_payload . PHP_EOL;

// 解密信息
$decoded_payload = $jwt->decode($encoded_payload);

// 输出解密后的信息
print_r($decoded_payload);

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