<?php
class CaptchaAction extends CCaptchaAction{
    public function validate($input, $caseSensitive)
    {
        $code = $this->getVerifyCode();
        $valid = $caseSensitive ? ($input === $code) : !strcasecmp($input, $code);
        $session = Yii::app()->session;
        $session->open();
        $name = $this->getSessionKey() . 'count';        
        if (!Yii::app()->request->isAjaxRequest) {
            $session[$name] = $session[$name] + 1;
        }        
        // 這里會重新生成
        if ($session[$name] > $this->testLimit && $this->testLimit > 0) {
                    $this->getVerifyCode(true);
        }
                return $valid;
    }
}

// 如果這里用到了驗證碼，就會出問題$model = new Test();

$model->validate();

$model->save();

// 這樣是正確的$model = new  Test();
// 把需要驗證的 attribute 放進(jìn)去，排除驗證碼字段
$model->validate(array('test1','test2'));
$model->save()