zhongshen_project/app/storeapi/controller/Captcha.php

<?php

namespace app\storeapi\controller;

use think\captcha\facade\Captcha as ThinkCaptcha;
use think\facade\Cache;

class Captcha extends BaseStoreApi
{

    public function __construct()
    {
        $this->params = input();
    }

    /**
     * 验证码
     */
    public function captcha()
    {
        if (isset($this->params[ 'captcha_id' ]) && !empty($this->params[ 'captcha_id' ])) {
            Cache::delete($this->params[ 'captcha_id' ]);
        }

        $captcha_data = ThinkCaptcha::create(null, true);
        $captcha_id = md5(uniqid(null, true));
        // 验证码10分钟有效
        Cache::set($captcha_id, $captcha_data[ 'code' ], 600);
        return $this->response($this->success([ 'id' => $captcha_id, 'img' => $captcha_data[ 'img' ] ]));
    }

    /**
     * 检测验证码
     * @param boolean $snapchat 阅后即焚
     */
    public function checkCaptcha($snapchat = true) : array
    {
        if (!isset($this->params[ 'captcha_id' ]) || empty($this->params[ 'captcha_id' ])) {
            return $this->error('', 'REQUEST_CAPTCHA_ID');
        }

        if (!isset($this->params[ 'captcha_code' ]) || empty($this->params[ 'captcha_code' ])) {
            return $this->error('', 'REQUEST_CAPTCHA_CODE');
        }

        if ($snapchat) $captcha_data = Cache::pull($this->params[ 'captcha_id' ]);
        else $captcha_data = Cache::get($this->params[ 'captcha_id' ]);
        if (empty($captcha_data)) return $this->error('', 'CAPTCHA_FAILURE');

        if ($this->params[ 'captcha_code' ] != $captcha_data) return $this->error('', 'CAPTCHA_ERROR');

        return $this->success();
    }
}