duandou2763 2014-01-28 19:46
浏览 19
已采纳

PHP会话新手，错误[重复]

This question already has an answer here:

so I am attempting to use sessions... I get this error:

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home1/####/public_html/####/index.php:3) in /home1/####/public_html/####/index.php on line 4

index.php:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<?php
    session_start();
    echo $_SESSION['logged_in'];
    echo $_SESSION['logged_user'];
?>
<head>

Any Idea why this might be happening?

</div>
  • 写回答

2条回答 默认 最新

  • douxie4583 2014-01-28 19:48
    关注

    Once you output HTML, or any content, PHP can no longer send the headers required to use sessions (i.e. set cookies). You must call session_start() before any output is generated from your script:

    <?php
    session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<?php
    echo $_SESSION['logged_in'];
    echo $_SESSION['logged_user'];
?>
<head>
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题？

悬赏问题

  • ¥100 set_link_state
  • ¥15 虚幻5 UE美术毛发渲染
  • ¥15 CVRP 图论 物流运输优化
  • ¥15 Tableau online 嵌入ppt失败
  • ¥100 支付宝网页转账系统不识别账号
  • ¥15 基于单片机的靶位控制系统
  • ¥15 真我手机蓝牙传输进度消息被关闭了，怎么打开？(关键词-消息通知)
  • ¥15 装 pytorch 的时候出了好多问题，遇到这种情况怎么处理？
  • ¥20 IOS游览器某宝手机网页版自动立即购买JavaScript脚本
  • ¥15 手机接入宽带网线，如何释放宽带全部速度