注：转载自网络，部分功能需优化，可按照此思路操作。

<?php  
    $conf['DB_USER'] = '数据库用户名';  
    $conf['DB_PWD'] = '数据库密码';  
    $conf['DB_NAME'] = '数据库名';  
    $conn = mysql_connect('localhost',$conf['DB_USER'],$conf['DB_PWD']);  
    if (!$conn) {  
        echo '数据库连接错误！';  
    }  
    mysql_set_charset('utf8', $conn);        //set charset  
    mysql_select_db($conf['DB_NAME']);       //select datebase     
    $sql2 = 'select catid,catname from 表前缀_category';  
    $cat = mysql_query($sql2);  
    while ($catrow=mysql_fetch_array($cat)) {  
        echo $catrow['catname'].'</br>';  
        $sql = '(select title,url from 表前缀_news where catid='.$catrow["catid"].' order by id desc)   
         UNION (select title,url from 表前缀_picture where catid='.$catrow["catid"].' order by id desc)';  
        $result = mysql_query($sql);  
        while ($row=mysql_fetch_array($result)) {     
            echo $row['url']."</br>";           
        }  
    }  
?>