从Cron选项卡调用时，PHP $ _SERVER ['DOCUMENT_ROOT']为空 [英] PHP $_SERVER['DOCUMENT_ROOT'] is empty when called from a Cron Tab

问题描述

当我使用以下代码时:

<?
print_r($_SERVER);
?>

我从所有服务器变量中得到了一个不错的列表.但是，当我在脚本中输入相同的代码(即由Cron Tab调用)时，没有列出很多变量.另外，Document_root变量没有值.

I get a nice list off all server variables. However, when I enter the same code in a script, that is being called by a Cron Tab, a lot of variables are not listed. Also, the Document_root variable has no value.

仅在移至其他服务器后才遇到此问题.我需要调整一些服务器设置来避免这种情况吗?

I only have had this issue after moving to a different server. Do I need to tweak some server settings to avoid this?

推荐答案

最好不要依赖此变量，因为它不一定总是设置(就像您发现的那样).

It's best not to rely on this variable as it isn't always set (just as you discovered).

尝试设置并使用如下常量:

Try setting and using a constant like this instead:

define('PUBLIC_PATH', '/var/www/path/to/public');

// OR something like:

define('PUBLIC_PATH', dirname(__DIR__) . '/public');

现在使用PUBLIC_PATH代替$_SERVER['DOCUMENT_ROOT']

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