$query=mysql_query("SELECT text from opus where id=$id",$dbconn);

 while($row=  mysql_fetch_array($query)){
    $text3=$row['text'];
    $text4=html_entity_decode($text3);
    echo $text4;
}

如上面这样 直接echo $text是OK的

但是像下边这样用XML返回到前端页面格式就变了

 echo "<?xml version='1.0' encoding='UTF-8'?>";
echo "<response>";
echo "<msg>";
echo "<text>$text4</text>";
echo "<id>$id</id>";
echo "</msg>";
echo "</response>";

求解~~