html - 自学php 遇到代码不执行直接在网页上显示望各位大神不吝赐教-PHP中文网问答

<html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <title>新闻客户端</title>
</head>
<body>
<center>国际新闻</center>
<table align="center"  width="100%">
<tr><td align="right"><a href="add.php?fl=3">添加国际新闻</a></td></tr>
</table><hr>
<table border="1" align="center" width="70%">
<tr><td  align="center"><a href="index.php">新闻</a></td>
<td align="center"><a href="guonei.php">国内</a></td>
<td align="center"><a href="guoji.php">国际</a></td>
<td align="center"><a href="shehui.php">社会</a></td>
<td align="center"><a href="gongyi.php">公益</a></td></tr>
</table>

<?
$conn=mysqli_connect('127.0.0.1', 'root', '459354wj', 'news');
if(!$conn)
{
    echo "连接数据库失败";
}
 echo "连接数据库成功";
$sql="set names utf8";
$rs=mysqli_query($conn,$sql);
    $sql="select * from t_news where id=3";
    $rs=mysqli_query($conn,$sql);
    if(!$rs)
    {
        mysqli_close($conn);
        echo "数据库查询失败";
    }
    echo "数据库查询成功";
    $recordCount=mysqli_num_rows($rs);

if($recordCount>0)
{
    echo "<table  align='center' width='70%'>";
    while($row=mysql_fetch_assoc($rs))
    {
        $id=$row['id'];
        $title=$row['title'];
        $subtitle=$row['subtitle'];
        $picture=$row['picture'];
        $content=$row['content'];
        $author=$row['author'];
        echo "<tr><td align='left'>";
        echo $row['picture'];
        echo "</td>";
        echo  "<td align='left'  colspan='4' ><b>";
        echo $row['title'];
        echo "</b><br>";
        echo $row['subtitle'];
        echo "<br>";
        echo  $row['author'];
        echo "</td>";
             echo "</tr>";
    }
    echo "</table>";
}

 mysqli_close($conn);

?>
</body>
</html>

问题貌似出在 $recordCount=mysqli_num_rows($rs); 这行但是实在搞不懂有什么问题网页执行后只显示一半另一半直接把代码输出了执行效果是这样的