How to solve the problem of garbled Chinese characters in php and garbled Chinese characters in the database

/*
 @Solution to garbled Chinese characters in the library
 @bbs.it-home.org
*/
include_once("conn.php");
include_once("include. php");
mysql_query("set names 'gbk'")or die("Failed to set character library n");
mysql_select_db($db)or die("Failed to connect to database!n");
$exec = " select * from $table";
//echo $exec;
$result = mysql_query($exec,$conn)or die("Query database failed n");
echo ""; for($cout=0;$cout{$city = mysql_result($result,$cout,city);$name = mysql_result($result,$cout,name) ;$phone = mysql_result($result,$cout,phone);echo "";echo "city: $city";echo "name: $name";echo "phone: $phone ";echo "";}echo "






";
?>