必看！ TP6驗證碼驗證失敗的原因及解決方法

composer require topthink/think-captcha

use think\captcha\facade\Captcha;

public function verify()
{
    return Captcha::create();
}

if( !Captcha::check($vercode)) {
    return json(['code'=>1001, 'msg'=>'验证码错误');
}

/**
 * 验证验证码是否正确
 * @access public
 * @param string $code 用户验证码
 * @return bool 用户验证码是否正确
 */
public function check(string $code): bool
{
    if (!$this->session->has('captcha')) {
        return false;
    }
 
    $key = $this->session->get('captcha.key');
 
    $code = mb_strtolower($code, 'UTF-8');
 
    $res = password_verify($code, $key);
 
    if ($res) {
        $this->session->delete('captcha');
    }
 
    return $res;
}

// 全局中间件定义文件
return [
    // 全局请求缓存
    // \think\middleware\CheckRequestCache::class,
    // 多语言加载
    // \think\middleware\LoadLangPack::class,
    // Session初始化
     \think\middleware\SessionInit::class
];