laravel 使用captcha库生成验证码的方法

 composer require gregwar/captcha

 <?php

 namespace App\Http\Controllers;
 
 use Gregwar\Captcha\CaptchaBuilder;
 use Session;
 
 class UserController extends Controller
 {
  //验证码
     public function VCode()
     {
         //生成验证码图片的Builder对象，配置相应属性
         $builder = new CaptchaBuilder;
         //可以设置图片宽高及字体
         $builder->build($width = 100, $height = 40, $font = null);
         //获取验证码的文本内容
         $phrase = $builder->getPhrase();
         //把内容存入session
         // Session::flash('milkcaptcha', $phrase);
         //生成图片
         return $builder->output();
     }
 }

 Route::get('user/VCode', 'UserController@VCode');

 <img src="{{ URL('user/VCode') }}"  alt="验证码" title="刷新图片" width="100" height="40" 
 onclick="this.src=this.src+'?k='+Math.random();">