在网站上安装 MediaWiki 结束后显示 Warning: Cannot modify header information 如何解决？

[Taxila]

在安装 MediaWiki 时显示警告：

Warning: putenv() has been disabled for security reasons in /storage/ssd1/808/4772808/public_html/includes/Setup.php on line 129

但是不影响 MediaWiki 的安装。

安装完成后，本来应该正常显示的网站主页只出现了如下报错代码：

Warning: putenv() has been disabled for security reasons in /storage/ssd1/808/4772808/public_html/includes/Setup.php on line 129

Warning: putenv() has been disabled for security reasons in /storage/ssd1/808/4772808/public_html/includes/Setup.php on line 129

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd1/808/4772808/public_html/LocalSettings.php:1) in /storage/ssd1/808/4772808/public_html/includes/libs/HttpStatus.php on line 112

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd1/808/4772808/public_html/LocalSettings.php:1) in /storage/ssd1/808/4772808/public_html/includes/WebResponse.php on line 46

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd1/808/4772808/public_html/LocalSettings.php:1) in /storage/ssd1/808/4772808/public_html/includes/WebResponse.php on line 46

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd1/808/4772808/public_html/LocalSettings.php:1) in /storage/ssd1/808/4772808/public_html/includes/WebResponse.php on line 46

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd1/808/4772808/public_html/LocalSettings.php:1) in /storage/ssd1/808/4772808/public_html/includes/WebResponse.php on line 46

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd1/808/4772808/public_html/LocalSettings.php:1) in /storage/ssd1/808/4772808/public_html/includes/WebResponse.php on line 46

Warning: Cannot modify header information - headers already sent by (output started at /storage/ssd1/808/4772808/public_html/LocalSettings.php:1) in /storage/ssd1/808/4772808/public_html/includes/WebResponse.php on line 46

楼主并非程序员，更没有 PHP 经验，只能摸索着试图解决。在网上看到有人说可以修改 PHP.ini 中“输出缓冲区数据块设置”解决，但在网站的空间内没有找到这个文件。托管商提供了 phpMyAdmin 工具，但是也并没有找到可以解决这个问题的地方，万般无奈之下只好来这里求助了，希望有人能指点迷津，不胜感激之至！

[muzhidianzi]

也是新手 野路子出身 萌新抛砖引玉下 貌似是 PHP 安全模式？ 部分函数被禁用了，需要去 php 的配置文件 php.ini 里禁用安全模式 看楼主描述貌似购买的是空间而不是 vps 或者服务器？这样应该是接触不到配置文件无法修改的。

此外 phpmyadmin 是一个基于 php 的 web 端数据库管理程序 只是基于 php 而已

有说错地方各位大佬斧正

[ysc3839]

关闭错误输出试试。一般情况下非开发环境不应该开启错误输出，以免泄漏敏感信息。

[muzhidianzi]

话说去 Google 的这个函数，居然搜到这个帖子，蜘蛛爬的真勤快

[580a388da131]

Warning: putenv() has been disabled
它不是说了函数 putenv() 被禁用了么

[Taxila]

@muzhidianzi 确实是空间而非服务器。查了一下确实没法改 php.ini ，但是可以改 .htaccess …

[Taxila]

@ysc3839 关闭错误输出应该去哪里关闭呢？

[muzhidianzi]

@Taxila 看下这个？ http://www.hankcs.com/appos/webhost/disable-err.html

[Taxila]

目前通过 https://www.mddhosting.com/support/knowledgebase/115/PHP---Cannot-modify-header-information---headers-already-sent-by-.html 给出的解决代码已经消除了 Warning: Cannot modify header information 警告，并且能够正常打开页面了。

但是页面上方依然有一行 Warning: putenv() has been disabled for security reasons in /storage/ssd1/808/4772808/public_html/includes/Setup.php on line 129 即使用到了 @muzhidianzi 给的代码也没法消除，还是令人不爽。

[RiESA]

@Taxila #8 用同样的方式关闭 display_errors 试试看?

[RiESA]

; display_errors
; Default Value: On
; Development Value: On
; Production Value: Off

; display_startup_errors
; Default Value: Off
; Development Value: On
; Production Value: Off

; error_reporting
; Default Value: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
; Development Value: E_ALL
; Production Value: E_ALL & ~E_DEPRECATED & ~E_STRICT

; html_errors
; Default Value: On
; Development Value: On
; Production value: On

; log_errors
; Default Value: Off
; Development Value: On
; Production Value: On

[RiESA]

我之前安装的时候也遇到过,不过我是通过修改 php.ini 处理的,上面是我目前的设置,你可以参考一下

[Taxila]

@RiESA 这里给出的代码是 php.ini 里面的吗？

[RiESA]

@Taxila 是的