카테고리 질문입니다 채택완료

<?php
include_once( $_SERVER["DOCUMENT_ROOT"]."/common.php") ;
include_once(G5_LIB_PATH.'/thumbnail.lib.php');

if( !$write_table )
    die(json_encode( array("msg"=>"잘못된 요청입니다.") ) );

if( !$min_y || !$min_x || !$max_y || !$max_x   )
    die(json_encode( array("msg"=>"필수 입력값이 등록되지 않았습니다.") ) );

$sql = "
    select * from {$write_table}
    where wr_is_comment = 0
    and wr_y between {$min_y} and {$max_y}
    and wr_x between {$min_x} and {$max_x}

    order by wr_num
";

$result = sql_query($sql);
$list = array();
for($i=0;$row = sql_fetch_array($result);$i++){

    $list[$i]['wr_id']        = $row['wr_id'];
    $list[$i]['wr_subject'] = $row['wr_subject'];
$list[$i]['wr_subject1'] = $row['wr_subject1'];
    $list[$i]['wr_content'] = $row['wr_content'];
    $list[$i]['wr_1']        = $row['wr_1'];
    $list[$i]['wr_2']        = $row['wr_2'];
    $list[$i]['wr_3']        = $row['wr_3'];
    $list[$i]['wr_4']        = $row['wr_4'];
    $list[$i]['wr_5']        = $row['wr_5'];
    $list[$i]['wr_6']        = $row['wr_6'];
    $list[$i]['wr_7']        = $row['wr_7'];
    $list[$i]['wr_8']        = $row['wr_8'];
    $list[$i]['wr_9']        = $row['wr_9'];
    $list[$i]['wr_10']        = $row['wr_10'];
    $list[$i]['wr_y']        = $row['wr_y'];
    $list[$i]['wr_x']        = $row['wr_x'];
$list[$i]['wr_ca_name']        = $row['wr_ca_name'];

---------------------------------------------------------------------------------

$list[$i]['wr_ca_name']  

카테고리

값을 읽어 오지못하네요

값이 null 또는  undefined  

로 나오는데 

다른방법이 있나요