Yii UserIdentity中的authenticate

authenticate方法,根据验证结果,返回各种错误码,包括

    const ERROR_NONE=0;
    const ERROR_USERNAME_INVALID=1;
    const ERROR_PASSWORD_INVALID=2;
    const ERROR_UNKNOWN_IDENTITY=100;

这样,在判断验证结果的时候,直接读取自缩写的定义身份类的errorCode属性就可以判断了

class UserIdentity extends CUserIdentity
{
private $_id;
public function authenticate()
{
$record=User::model()->findByAttributes(array('username'=>$this->username));
if($record===null)
$this->errorCode=self::ERROR_USERNAME_INVALID;
else if($record->password!==md5($this->password))
$this->errorCode=self::ERROR_PASSWORD_INVALID;
else
{
$this->_id=$record->id;
$this->setState('title', $record->title);
$this->errorCode=self::ERROR_NONE;
}
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return !$this->errorCode;
}