PHP+MYSQL链接数据库3分页

$host="localhost";
    $username="root";
    $password="";
    $db="test2";
     $conn=mysqli_connect($host,$username,$password);
    if(!$conn){
        echo "数据库连接失败";
        exit;
    }
    mysqli_select_db($conn,$db);
    mysqli_query($conn,"SET NAMES UTF8");
    echo "<div class='content'>";
    echo "<table border=1 cellspacing=0 width=30% align=center>";
    echo "<tr><td>ID</td><td>NAME</td></tr>";
    echo "</table>";
    echo "</div>";
    mysqli_free_result($result);

先链接数据库看看是否能链接成功，成功的话，就然后是看先写好头下面的请看分页4