<?php
//(1).資料庫設定
$dbServer = "localhost";
$dbUser = "root";
$dbPass = "密碼";
$dbName = "資料庫";

//(2).連線資料庫伺服器
$conn = @mysqli_connect($dbServer, $dbUser, $dbPass, $dbName);

if (mysqli_connect_errno($conn))
  die("無法連線資料庫伺服器");

//(3).設定連線的字元集為 UTF8 編碼
mysqli_set_charset($conn, "utf8");

///讀取要排序的欄位//////////////////////////
if(isset($_GET['sortcolumn'])){
$sortcolumn = $_GET['sortcolumn'];
}else{
$sortcolumn = "預設欄位名稱";
}

//查詢資料表的的資料
$sql="SELECT * FROM 資料表 order by ".$sortcolumn." desc";

$result = $mysqli->query($sql);

//給定$row[][]二維陣列-文字欄位///////////////////////////////
while($row[]=mysqli_fetch_array($result,MYSQLI_ASSOC)){
} 
....

////釋放記憶體////////////////////////////
require_once("mysqlclose.inc.php");

?>