本文以实例形式讲述了yii创建验证码的方法，具体步骤如下所示：

一、在SiteController action()下添加如下代码：

return array(
 // captcha action renders the CAPTCHA image displayed on the contact page
 "captcha"=>array(
 "class"=>"CCaptchaAction",
 "backColor"=>0xFFFFFF,
 ),
 // page action renders "static" pages stored under "protected/views/site/pages"
 // They can be accessed via: index.php?r=site/page&view=FileName
 "page"=>array(
 "class"=>"CViewAction",
 ),
);

二、(1)在LoginForm model rules()下添加代码：

//captche class needed
array("verifyCode", "captcha","allowEmpty"=>!CCaptcha::checkRequirements()),

    (2)LoginForm model下添加属性：

public $verifyCode;

三、在ContactForm model rules()下添加代码：

// verifyCode needs to be entered correctly
array("verifyCode", "captcha", "allowEmpty"=>!CCaptcha::checkRequirements()),

四、在login view下添加代码：

<div class="row">
<?php
echo $form->labelEx($model,"verifyCode");
?>
<?php
$this->widget("CCaptcha");
?>
<?php
echo $form->textField($model,"verifyCode");
?>
<?php
echo $form->error($model,"verifyCode");
?>
</div>

本例代码仅为主要功能简述，读者还可以根据自身项目需求进一步完善该程序代码，使其功能更具实用性。