MySQL循环遍历执行查询SQL语句结果的方法

<?php
 $conn=mysql_connect("localhost","root","") or die("数据库连接失败");
 $set=mysql_select_db("a1202200719",$conn)or die("数据库为空");
 mysql_query("SET NAMES `GBK`");
 $sql="SELECT * FROM `msg`";
 $query=mysql_query($sql);
 
 while($row=mysql_fetch_array($query)){
	<?php echo $row['id']?>
    	<?php echo $row['name']?>
    	<?php echo $row['content']?>
?><?php
 $conn=mysql_connect("localhost","root","