php 中文乱码 php 中文字符入库或显示乱码问题的解决办法

<?php
/*
filename:query.php
do:get and show the data
author:www.5dkx.com
*/
include_once("conn.php");
include_once("include.php");
mysql_query("set names 'gbk'")or die("设置字符库失败\n");
mysql_select_db($db)or die("连接数据库失败!\n");
$exec = "select * from $table";
//echo $exec;
$result = mysql_query($exec,$conn)or die("查询数据库失败\n");
echo "<table border=2>";
for($cout=0;$cout<mysql_numrows($result);$cout++)
{
$city = mysql_result($result,$cout,city);
$name = mysql_result($result,$cout,name);
$phone = mysql_result($result,$cout,phone);
echo "<tr>";
echo "city: $city";
echo "name: $name";
echo "phone: $phone";
echo "</tr>";
}
echo "</table>";
?>