图片验证码怎么改成 纯数字的？

调用一下 build

@liyu001989 谢谢已经解决

<?php

namespace App\Http\Controllers\Api\V1;

use Illuminate\Http\Request;
use Gregwar\Captcha\CaptchaBuilder;
use Gregwar\Captcha\PhraseBuilder;
use App\Http\Requests\Api\CaptchaRequest;

class CaptchaController extends Controller
{
    public function store(CaptchaRequest $request)
    {
        $phraseBuilder = new PhraseBuilder(5, '0123456789');
        $captchaBuilder = new CaptchaBuilder(null, $phraseBuilder);
        $captcha = $captchaBuilder->build();//创建验证码图片
        $key = 'captcha-'.str_random(15);
        $expiredAt = now()->addMinutes(10);//10分钟后过期
        // getPhrase 获取验证码文本，跟手机号一同存入缓存。
        \Cache::put($key, ['mobile' => $request->mobile, 'code' => $captcha->getPhrase()], $expiredAt);

        $result = [
            'captcha_key' => $key,
            'expired_at' => $expiredAt->toDateTimeString(),
            //获取 base64 图片验证码
            'captcha_image_content' => $captcha->inline()
        ];

        return $this->response->array($result);
    }
}