!DOCTYPE html>
html>
head>
  title>业务A的验证码页面/title>
/head>
body>
  img src="" alt="验证码" id="imgValCode">
/body>
/html>
 script src="jquery.js">/script>
  script type="text/javascript">
  $.ajax({
    url: '/Captcha/A/refresh', //不同业务模块调用不同的url B业务调用/Captcha/B/refresh
    type: 'get',
    dataType: 'json',
    async: true,
    success:function(data) {
      if ( data.src ) {
        $('#imgValCode').attr('src',data.src);
      }
    }
  });
/script>

?php
/**
 * yii1.0 验证码类
 * 多个验证码，方式业务A页面和业务B页面同时打开，共用一个验证码session，导致其中一个被失效的问题
 */
class CaptchaController extends CHttpModuleController 
{
  /**
   * 验证码生成函数
   */
  public function actions() 
  {
    return [
      //A业务验证码
      'A' => [
        'class' => 'application.components.MyCaptcha.MyCaptchaAction',
        'backColor' => 0xFFFFFF,
        'minLength' => 5,
        'maxLength' => 5,
        'offset' => 5,
        'testLimit' => 1,
        'width' => 100,
        'height' => 40,
        'isInterferingLine' => true, //是否启用干扰线
        'interferingLineNumber' => 8, //干扰线数量设置
        'foreColor' => '0x0c0c0e'
      ],
      //B业务验证码
      'B' => [
        'class' => 'application.components.MyCaptcha.MyCaptchaAction',
        'backColor' => 0xFFFFFF,
        'minLength' => 5,
        'maxLength' => 5,
        'offset' => 5,
        'testLimit' => 1,
        'width' => 100,
        'height' => 40,
        'isInterferingLine' => false, //是否启用干扰线
        'interferingLineNumber' => 8, //干扰线数量设置
        'foreColor' => '0x0c0c0e'
      ]
    ];
  }

  /**
   * 验证码验证函数
   * 在需要验证验证码的控制器中调用，传递businessId(业务类型id)作为区分不同验证码的id
   * 调用方式：
   * Yii::app()->runController('Captcha/actionVerifyCode',[ 'businessId' => 'A' ]);
   */
  public function actionVerifyCode($businessId) 
  {
    $code = Yii::app()->request->getPost('code');        //接收用户输入的验证码
    if ( $businessId == 'A' ) {
      $vcode = $this->createAction('A')->getVerifyCode();   //获取A业务的验证码
    } else if ( $businessId == 'B' ) {
      $vcode = $this->createAction('B')->getVerifyCode();   //获取B业务的验证码
    }
    if ( empty($vcode) || empty($code) || $vcode != $code ) {  //验证用户输入验证码与验证码是否相等
      return false;    //验证不通过
    }
    return true;  //验证通过
  }
}
?>