php access以中文作为参数进行数据查询时出现乱码。

先上代码：

<?php



include_once("Conn.php");



$testJSON=array();

$str = trim($_GET['dept']);  



$mysql ="  select *,0 as ord from checkpro where ifstop=0 and dept like '*".$str."*'  ";



echo $mysql; 

 

 $rs = $conn->Execute($mysql);

 while(!$rs->EOF) 

            { 				



	$mydept =iconv('gb2312','utf-8',$rs->Fields['dept']->Value);

	$mypro =iconv('gb2312','utf-8',$rs->Fields['pro']->Value);

	$mynote =iconv('gb2312','utf-8',$rs->Fields['note']->Value);

	$mykf =iconv('gb2312','utf-8',$rs->Fields['kf']->Value);



	echo $mydept;

	

    $testJSON[] = array('dept'=>"".$mydept."","pro"=>"".$mypro."","note"=>"".$mynote."","kf"=>"".$mykf."");   

   	$rs->MoveNext();

      }

  

 foreach ( $testJSON as $key => $value ) { 

 

     foreach ( $testJSON[$key] as $key_k => $value_k ) { 

        $testJSON[$key][$key_k] = urlencode ($value_k);  

	 }

    }  

   echo urldecode ( json_encode ( $testJSON ) );  



         /*释放资源*/

         $rs->Close();

      $conn->Close();

      $rs = null;

      $conn = null;



?> 

如果我在地址栏输入：
http://192.168.0.30:81/fkfs/jsons_a/json_deptchpro.php?dept=办公室
那么就会出现如图的错误，如果参数是英文的就不会。


如果我在地址栏输入：
http://192.168.0.30:81/fkfs/jsons_a/json_deptchpro.php?dept=通用
这时不会出现错误，这个参数得到的结果应该是正确的，但是却不显示任何记录。
问大家，这个该怎么解决，谢谢！