<?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";
$result=mysqli_query($con,$sql);// 关联数组
$row=mysqli_fetch_assoc($result);
printf ("%s : %s)",$row["name"],$row["url"]);// 释放结果集
mysqli_free_result($result);mysqli_close($con);
?>

http://www.runoob.com/php/func-mysqli-fetch-assoc.html