很多错误哦,一是字符串要用引号,二是要判断数组的成员是否定义,例如你的第3行：
if ($_POST[order] != "" && $_POST[sortorder] != "") {
应该修改为：
if (isset($_POST['order']) && isset($_POST['sortorder']) && $_POST['order']!= "" && $_POST['sortorder'] != "") {
Use of undefined constant order - assumed 'order'
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