How to generate verification code in yii2

1. Add the code in the controller

public function actionCaptcha(){
    $c = Yii::createObject('yii\captcha\CaptchaAction', ['__captcha', $this]);
    $c->getVerifyCode(true);
    return $c->run();
}

2. Call the verification code through the following method

$c = Yii::createObject('yii\captcha\CaptchaAction', ['__captcha', $this]);
$code = $c->getVerifyCode();

$code is generated before Verification code

Note: $this represents the current controller, this method is only suitable for use in one controller.

3. Front-end call:

Write a

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