后台管理系统总是成百万的数据导出,使用excel导出根本不能实现,excel只支持65536,2007和2010的是1048576,所以无论哪一种都不能满足需求,csv就符合需求,不限制记录的条数,但是大量数据如果一次性处理导出,会直接导致内存溢出,脚本停止工作,所有采用分割方式导出是比较有好处的。
<?php error_reporting(0); header ( "Content-type:application/vnd.ms-excel" ); header ( "Content-Disposition:filename=" . iconv ( "UTF-8", "GBK", "topic" ) . ".csv" ); //连接数据库 $link = mysql_connect('localhost','root','root') or die('连接错误'); //选择数据库 mysql_select_db("bbs",$link); //设置字符集 mysql_query("set names utf8"); //查询函数 function get_res($sql,$link){ $res = mysql_query($sql,$link); if(!$res){ die("操作失败".mysql_error()); } $arr=array(); while ($row = mysql_fetch_assoc($res)) { $arr[]=$row; } return $arr; } //查询记录总数 function getTotalCount(){ $result = mysql_query("SELECT count(*) as count FROM medsci_edu_public_medsciedu_topic", $link); return $result['count']; } // 打开PHP文件句柄,php://output 表示直接输出到浏览器 $fp = fopen('php://output', 'a'); //表头 $column_name = array('topic_id','cat_id','user_id','is_best','is_top','topic_title','topic_content','topic_img','hits','total_reply_count','created_time','last_updated_time','topic_status','last_reply_name'); // 将中文标题转换编码,否则乱码 foreach ($column_name as $i => $v) { $column_name[$i] = iconv('utf-8', 'gbk', $v); } // 将标题名称通过fputcsv写到文件句柄 fputcsv($fp, $column_name); $pagecount = 10000;//一次读取多少条 $totalcount = getTotalCount();//总记录数 $sql = "select * from medsci_edu_public_medsciedu_topic"; for ($i=0;$i<intval get_res limit foreach as array iconv fputcsv unset ob_flush flush exit>结果测试: <br> <br> <p></p> <p class="sycode"> </p> <p>版权声明:本文为博主原创文章,未经博主允许不得转载。</p> </intval>

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.


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