PHP development framework Yii Framework tutorial (21) UI component Captcha example

Yii's built-in Captcha can basically meet most needs. If you have special requirements for verification codes, you can customize Captcha. This is

mainly achieved by extending CCaptchaAction. In this example, customization A verification code function that randomly generates addition and subtraction within 10. Users need to calculate the correct result to pass the verification.

First create a MathCaptchaAction in the protected/components directory and overload generateVerifyCode,

renderImage and other methods:

class MathCaptchaAction
extends CCaptchaAction{
protected function generateVerifyCode(){return mt_rand((int)$this->minLength,(int)$this->maxLength);}
public function renderImage($code){parent::renderImage($this->getText($code));}
protected function getText($code){$code=(int)$code;$rand=mt_rand(1,$code-1);$op=mt_rand(0,1);if($op){
return $code-$rand. '+' . $rand;
}else{return $code+$rand. '-' . $rand;}}}

Then modify the rules of SiteController and use the newly created MathCaptchaAction

public function actions()
{
return array(
'captcha'=>array(
'class' => 'MathCaptchaAction',
'minLength' => 1,
'maxLength' => 10,
)

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