使用PHP和MySql完成的简单图书馆信息管理系统

								session_start();
				require_once("include_all.php");
				
				html_header_output(" - 瓒呮湡鎶ヨ〃","瓒呮湡鎶ヨ〃");
				if (check_admin_user())
				{
					if( ($overtime_books = get_overtime_data()) )
					{
						display_overtime_books($overtime_books);
					}
					else
					{
						echo "瓒呮湡鍥句功淇℃伅璇诲彇澶辫触銆