<?php

// 假定数据库用户名：root，密码：123456，数据库：RUNOOB

$con=mysqli_connect("localhost","root","123456","RUNOOB");

if (mysqli_connect_errno($con))

{

    echo "连接 MySQL 失败: " . mysqli_connect_error();

} 

$sql = "SELECT name,url FROM websites ORDER BY alexa;";

if ($result=mysqli_query($con,$sql))

{

    // 返回记录数

    $rowcount=mysqli_num_rows($result);

    printf("总共返回 %d 行数据。",$rowcount);

    // 释放结果集

    mysqli_free_result($result);

}

mysqli_close($con);

?>