Yii使用Captcha验证码的方法

本文实例讲述了yii使用captcha验证码的方法。分享给大家供大家参考，具体如下：

详细代码可参考:yii自带的示例代码post项目，里面有一个contact表单用到了验证码.

1. model:

将验证码加入userlogin的一个属性:

class userlogin extends cformmodel
{
 public $username;
 public $password;
 public $rememberme;
 public $verifycode;
 public function rules()
 {
  return array(
   // username and password are required
   array('username, password,verifycode', 'required'),
   // rememberme needs to be a boolean
   array('rememberme', 'boolean'),
   // password needs to be authenticated
   array('password', 'authenticate'),
   // verifycode needs to be entered correctly
   array('verifycode', 'captcha', 'allowempty'=>!ccaptcha::checkrequirements()),
  );
 }
 /**
  * declares attribute labels.
  */
 public function attributelabels()
 {
  return array(
   'rememberme'=>yii::t('user',"remember me next time"),
   'username'=>yii::t('user',"username or email"),
   'password'=>yii::t('user',"password"),
   'verifycode'=>yii::t('user','verification code'),
  );
 }
}

2. controller

在logincontroller控制器加入映射动作ccaptchaaction

public function actions()
{
 return array(
  // captcha action renders the captcha image displayed on the contact page
  'captcha'=>array(
   'class'=>'ccaptchaaction',
   'backcolor'=>0xf4f4f4,
   'padding'=>0,
   'height'=>30,
   'maxlength'=>4,
  ),
  );
}
ublic function actionlogin()
{
 if (yii::app()->user->isguest) {
  $model=new userlogin;
  // collect user input data
  if(isset($_post['userlogin']))
  {
   $model->attributes=$_post['userlogin'];
//在此核对验证码
   if($this->createaction('captcha')->validate($model->verifycode, false))
   {
    // validate user input and redirect to previous page if valid
    if($model->validate()) {
    //admin login only
    if( yii::app()->getmodule('user')->isadmin()==1 )
    {
    $this->lastviset();
    if (strpos(yii::app()->user->returnurl,'/index.php')!==false)
     $this->redirect(yii::app()->controller->module->returnurl);
    else
     $this->redirect(yii::app()->user->returnurl);
    }else
    {//if no admin when login out
     $this->redirect(yii::app()->controller->module->logouturl);
    }
   }
   }else
   {//提示错误
    $model->adderror('verifycode','验证码不对');
   }
  }
  // display the login form
  $this->render('/user/login',array('model'=>$model));
 } else
  $this->redirect(yii::app()->controller->module->returnurl);
}

在验证用户名密码前，检查验证码：

if($this->createaction('captcha')->validate($model->verifycode, false))
{

3. view

在视图中显示验证码图片,输入框

<?php $this->widget('ccaptcha'); ?>
  <?php echo chtml::activetextfield($model,'verifycode',array('tabindex'=>1)); ?>
<img src="http://www.xxxx.net/uploads/123456.jpg" alt="">

希望本文所述对大家基于yii框架的php程序设计有所帮助。