The use of graphical verification codes for laravel framework learning (4)

composer require gregwar/captcha=1.*

use Gregwar\Captcha\CaptchaBuilder;
public function xxx(Request $request){
       $builder = new CaptchaBuilder;       
       $builder->build();       
       $bb = $builder->inline();  //获取图形验证码的url
       $request->session()->put('piccode', $builder->getPhrase());  //将图形验证码的值写入到session中
       return view('abc',["bb"=>$bb]);
   }

 <img src="{{$bb}}" name="imgc" id="imgc" alt="换一张" class="get-code" height="36" width="80">