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PHP如何同时查询多个ID

PHP怎么同时查询多个ID?

include 'include/cmsdj.conn.php'; 
$CD_ID=SafeRequest('id','get');
global $db;
$sql='Select * from '.tname('dj').' where CD_ID='.$CD_ID.'';
$row=$db->getrow($sql);
$server=$db->getrow('select * from '.tname('server').' where CD_ID='.$row['CD_Server'].'');
if($row){
$CD_Url=$row['CD_Url'];
$playurl=$server['CD_Url'].$CD_Url;
echo '';}
?>


上面代码是只读取单个ID的
显示
XX.php?id=5555

如果我要它显示多个ID的结果呢?
比如:xx.php?id=5555,6666,1111
相对显示的是



要怎么整呢?


------解决方案--------------------
echo ''."\n";