<?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))

{

    // 获取所有列的字段信息

    while ($fieldinfo = mysqli_fetch_field($result)) {

        printf("字段名:     %s\n", $fieldinfo->name);

        echo "<br>";

        printf("数据表:    %s\n", $fieldinfo->table);

        echo "<br>";

        printf("最大长度: %d\n", $fieldinfo->max_length);

        echo "<br>";

    }

    // 释放结果集

    mysqli_free_result($result);

}

mysqli_close($con);

?>