031.CI4框架CodeIgniter,使用自带的encryption加密类

<?php namespace App\Controllers;

class Hello extends BaseController
{
    //http://127.0.0.1/CI4/public/index.php/hello/

    public $encrypter;

    function __construct()
    {
        // 加载加密类
        $this->encrypter = \Config\Services::encrypter();
    }

    public function index()
    {
        $text = ‘青青子衿悠悠我心‘;
        $encryptiontext = $this->encrypter->encrypt($text);

        // 输出的是一段加密后的乱码
        echo $encryptiontext . "<br><br>";

        // 输出: 青青子衿悠悠我心
        echo $this->encrypter->decrypt($encryptiontext);
    }
    //--------------------------------------------------------------------
}

public $key = ‘tianpan‘;//写入加密key