求问：其它输出都正常，就是错误输出是乱码！

<?php/** * Created by runner.han * There is nothing new under the sun */header('Content-type:text/html;charset=utf-8');  include_once 'header.php';include_once 'inc/config.inc.php';$dbhost=DBHOST;$dbuser=DBUSER;$dbpw=DBPW;$dbname=DBNAME;$dbport=DBPORT;$mes_connect='';$mes_create='';$mes_data='';$mes_ok='';if(isset($_POST['submit'])){ $link =  mysqli_connect($dbhost, $dbuser, $dbpw ,$dbport);    //判断数据库连接    //if(!@mysqli_connect($dbhost, $dbuser, $dbpw)){ //if(!@mysqli_connect("localhost", "root", "root", "13306")){ if(!$link){        echo '数据连接失败，请仔细检查inc/config.inc.php的配置';  echo "Error: Unable to connect to MySQL." . PHP_EOL;        echo "Debugging errno: " . mysqli_connect_errno() ;        echo "Debugging error: " . mysqli_connect_error() ;        exit;  //exit(mysqli_connect_error());    }    $link=mysqli_connect(DBHOST, DBUSER, DBPW);    $mes_connect.="<p class='notice'>数据库连接成功!