thinkphpエラーメッセージのテキストが文字化けする

 E(mysql_error());

<?php// +----------------------------------------------------------------------// | OneThink [ WE CAN DO IT JUST THINK IT ]// +----------------------------------------------------------------------// | Copyright (c) 2013 http://www.onethink.cn All rights reserved.// +----------------------------------------------------------------------// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>// +----------------------------------------------------------------------namespace Admin\Controller;use User\Api\UserApi as UserApi;/** * 后台首页控制器 * @author 麦当苗儿 <zuojiazi@vip.qq.com> */class PublicController extends \Think\Controller {    /**     * 后台用户登录     * @author 麦当苗儿 <zuojiazi@vip.qq.com>     */    public function login($username = null, $password = null, $verify = null){        if(IS_POST){            /* 检测验证码 TODO: */            if(!check_verify($verify)){                $this->error('验证码输入错误！');            }            /* 调用UC登录接口登录 */            $User = new UserApi;            $uid = $User->login($username, $password);            if(0 < $uid){ //UC登录成功                /* 登录用户 */                $Member = D('Member');                if($Member->login($uid)){ //登录用户                    //TODO:跳转到登录前页面                    $this->success('登录成功！', U('Index/index'));                } else {                    $this->error($Member->getError());                }            } else { //登录失败                switch($uid) {                    case -1: $error = '用户不存在或被禁用！'; break; //系统级别禁用                    case -2: $error = '密码错误！'; break;                    default: $error = '未知错误！'; break; // 0-接口参数错误（调试阶段使用）                }                $this->error($error);            }        } else {            if(is_login()){                $this->redirect('Index/index');            }else{				/* 读取数据库中的配置 */				$config	=	S('DB_CONFIG_DATA');				if(!$config){					$config	=	D('Config')->lists();					S('DB_CONFIG_DATA',$config);				}				C($config); //添加配置				                $this->display();            }        }    }    /* 退出登录 */    public function logout(){        if(is_login()){            D('Member')->logout();			session('[destroy]');            $this->success('退出成功！', U('login'));        } else {            $this->redirect('login');        }    }    public function verify(){        $verify = new \COM\Verify();        $verify->entry(1);    }}