图片验证码生成失败

$captcha = new CaptchaBuilder("5+8 = ?");
$code = $captcha->getPhrase();
 \Cache::put($key, ['phone' => $phone, 'code' => $captcha->getPhrase()], $expiredAt);
 
$captcha->build();
$result = [
    'captcha_key' => $key,
    'expired_at' => $expiredAt->toDateTimeString(),
    'captcha_image_content' => $captcha->inline()
];

$builder = new CaptchaBuilder(‘12345’)", 其中的 12345 (phrase) 必须为 string
但是这样再使用 $builder->inline() 会报错, 无法生成验证码图片,如上代码即可显示

图片验证码个别符号乱码

if ($font === null) {
     $rand = $this->rand(0, 5);
      if($rand == 2){
          $rand = 3;
      }
      $font = __DIR__ . '/Font/captcha'.$rand.'.ttf';
      // $font = __DIR__ . '/Font/captcha2.ttf';
  }