PHP 未定义索引（WP 客户区在文件下载时中断）

Question

我工作的公司正在为我们的一位客户使用客户区，直到最近一切都很好。当尝试下载私人文件时，我们会收到几条错误消息：

Notice: Undefined index: force-download in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php on line 1029

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php:1029) in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-default-handlers.class.php on line 945

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php:1029) in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-default-handlers.class.php on line 952

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php:1029) in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-default-handlers.class.php on line 955

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php:1029) in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-default-handlers.class.php on line 956

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php:1029) in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-default-handlers.class.php on line 959

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php:1029) in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-default-handlers.class.php on line 960

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php:1029) in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-default-handlers.class.php on line 961

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php:1029) in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-default-handlers.class.php on line 989

当尝试通过插件重置插件设置或数据库时，我们也遇到错误：

Notice: Undefined index: cuar_admin_theme_url in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-classes/settings.class.php on line 674

Warning: Cannot modify header information - headers already sent by (output started at /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-classes/settings.class.php:674) in /Users/mathew/Websites/mamp/portal-test/wp-includes/pluggable.php on line 1216

我们正在使用我们自己的 WordPress 主题，我们已经删除了所有自定义的 WP 客户专区模板，甚至将主题切换为 TwentySeventeen，但错误仍然出现。除了切换主题，我们还尝试卸载并重新安装插件。

所以我们决定创建一个新的空白 WordPress 环境并在那里进行测试，然后重新下载插件以确保它是新的。下载按钮随后开始工作，但在测试 second/third 时间后返回错误。

如前所述，该插件在昨天被发现之前一直运行良好。我们没有编辑任何核心文件，只有我们按照 WP 客户区的说明所做的模板文件。该站点是运行 WordPress 4.9.1，插件版本是 7.4.5。但是，我们已经尝试使用 Wordpress 4.9 和插件版本 7.4.0、7.3.0。

如果有人可以提供帮助，我们将不胜感激。感谢您抽空阅读我的留言。

谢谢

Answer 1

我联系了 WP 客户区的人员，他们正在调查这个问题，因为它似乎是插件中的一个错误。但与此同时，他们给了我一些代码来通过替换来阻止错误：

!isset($_GET['force-download']) && $_GET['force-download'] != 1)

第 1029 行 customer-area/src/php/core-addons/private-file/private-file-addon.class.php.

行：

if ( !isset($_GET['force-download']) || (isset($_GET['force-download']) && $_GET['force-download'] !== 1))

这帮助我解决了错误，希望对你们也有帮助。

Answer 2

不幸的是，您可能需要通过大量代码来解决这个错误，但一般的修复方法是识别假设数组键存在的情况，并用一些代码修复它。

错误告诉你从哪里开始：

Notice: Undefined index: force-download in /Users/mathew/Websites/mamp/portal-test/wp-content/plugins/customer-area/src/php/core-addons/private-file/private-file-addon.class.php on line 1029

根据索引名称，force-download 我猜这是 HTML 表单上复选框的值。未选中时，不会通过 HTTP POST 传递任何值，但脚本正在 $_POST 中查找此值（此处猜测）。

我能给出的最好建议是用类似以下的方法修复此实例：

<?PHP

if( array_key_exists( 'force-download', $_POST ) && $_POST['force-download'] )
{
    // do something
}

?>

我为表格所做的工作：

为了始终具有 $_POST 值，我在复选框字段之前输出了一个值为零的隐藏表单字段。然后复选框字段的值为 1。这样，如果选中复选框字段，则通过 $_POST 传递“1”，而我的 if 语句就可以正常工作，而不必总是不断地检查空，array_key_exists，等等

PHP 未定义索引（WP 客户区在文件下载时中断）

PHP Undefined Index (WP Customer Area breaks on file download)

php

wordpress

warnings

undefined