function add_l_x($mid,$f,$isadd,$isq,$value,$cs){
global $empire,$dbtbpre,$public_r,$class_r;
$k = $_POST['k'];
$sql=$empire->query("select * from {$dbtbpre}ecms_xx where k like '$k%' order by zs asc,qz desc limit 10");
while($r=$empire->fetch($sql))
{
$value .= $r['title'];
}
return $value;
只能输出1条数据,while怎样赋值到变量输出,请求指导