如何直接使用验证码，而不是跟Form一起使用

qq277049 · July 8, 2014, 5:56am

按照这里http://yii2-user.readthedocs.org/en/latest/howto/adding-captcha.html可以成功显示验证码，但是现在我想要把验证码单独拿出来使用。要怎么用？

xjflyttp · October 29, 2014, 6:25am

yii\captcha\CaptchaAction 输出验证码图片数据
yii\captcha\Captcha widget显示到前台html (可以自行显示action数据)
yii\captcha\CaptchaValidator::validate($userInputCaptcha) 验证captcha数据

yiisoft/yii2/blob/master/framework/captcha/CaptchaValidator.php

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\captcha;

use Yii;
use yii\base\InvalidConfigException;
use yii\validators\ValidationAsset;
use yii\validators\Validator;

/**
 * CaptchaValidator validates that the attribute value is the same as the verification code displayed in the CAPTCHA.
 *
 * CaptchaValidator should be used together with [[CaptchaAction]].
 *
 * Note that once CAPTCHA validation succeeds, a new CAPTCHA will be generated automatically. As a result,

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github.com

yiisoft/yii2/blob/master/framework/captcha/CaptchaAction.php

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\captcha;

use Yii;
use yii\base\Action;
use yii\base\InvalidConfigException;
use yii\helpers\Url;
use yii\web\Response;

/**
 * CaptchaAction renders a CAPTCHA image.
 *
 * CaptchaAction is used together with [[Captcha]] and [[\yii\captcha\CaptchaValidator]]
 * to provide the [CAPTCHA](http://en.wikipedia.org/wiki/Captcha) feature.

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