发送验证码

一.安装验证码 composer 扩展包#

安装扩展包：
```
composer require mews/captcha
```
生成配置文件，并选择 Mews\Captcha\CaptchaServiceProvider 代表的数字回车
```
php artisan vendor:publish
```
修改 config/captcha.php , 修改 flat 长度为 4 位

修改注册模板，添加验证码

<div class="form-group row">
  <label for="captcha" class="col-md-4 col-form-label text-md-right">验证码</label>
      <div class="col-md-6">
         <input id="captcha" class="form-control{{ $errors->has('captcha') ? ' is-invalid' : '' }}" name="captcha" required>
          <img class="thumbnail captcha mt-3 mb-2" src="{{ captcha_src('flat') }}" onclick="this.src='/captcha/flat?'+Math.random()" title="点击图片重新获取验证码">
             @if ($errors->has('captcha'))
                 <span class="invalid-feedback" role="alert">
                     <strong>{{ $errors->first('captcha') }}</strong>
                    </span>
                @endif
        </div>
</div>

后端添加验证码 captcha 验证

protected function validator(array $data)
 {
     return Validator::make($data, [
         'name' => ['required', 'string', 'max:255'],
         'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
         'password' => ['required', 'string', 'min:8', 'confirmed'],
         'captcha' => ['required', 'captcha'],
     ], [
         'captcha.required' => '验证码不能为空',
         'captcha.captcha' => '请输入正确的验证码',
     ]);
 }