如果由Cron运行，PHP`exec（）`不起作用 [英] PHP `exec()` doesn't work if run by Cron

问题描述

我有一个crontab每分钟调用一次的PHP脚本，如下所示：

I have a PHP script that is being called every minute by crontab like this:

* * * * * /usr/bin/php /var/www/html/cronjobs/watchdog/watchdogExec.php

脚本执行许多其他PHP脚本并传递如下变量：

The script executes a number of other PHP scripts and passes a variable like so:

$ccmd = "nohup sudo /usr/bin/php watchdog.php " . $var . " &";
exec($ccmd);

从浏览器调用时， watchdogExec.php 运行良好，并且工作。但是，当我添加cronjob时，脚本无法正常工作，并且正在向邮件发送垃圾邮件，并显示以下错误：

When called from a browser, watchdogExec.php runs fine and does its job. However when I added the cronjob, the script is not working and is spamming mails with the following error:

No entry for terminal type "unknown";
using dumb terminal settings.

此错误出现的次数与 exec（）被调用，所以我认为这一定是问题所在。我搜索并了解到cronjob在终端中未运行命令的情况，并尝试在crontask中设置环境，但这无济于事。显然PHP正在打印该错误，但是我在他们的文档中没有发现任何有关此错误的信息。

This error appears the same number of times exec() is called, so I figured that must be the issue. I searched and read about cronjob not running commands in a terminal, and I tried setting the environment in the crontask, but it did not help. Apparently PHP is printing that error, but I haven't found anything in their documentation about it.

* * * * *  /usr/bin/env TERM=xterm /usr/bin/php /var/www/html/cronjobs/watchdog/watchdogExec.php

我正在运行CentOS 7。

I am running CentOS 7.

编辑：

进行了更多搜索并找到了了解有关PHP环境变量的信息。有人通过在他们的PHP脚本中添加以下内容来解决类似的问题。但是，这不能解决我的问题，只能停止垃圾邮件。该脚本仍无法正常工作。

Searched some more and found out about PHP environment variables. Someone fixed a similar problem by adding the following in their PHP script. However this is not fixing my problem, it only stops the mail spam. The script is still not working.

putenv('SHELL=/bin/bash');
putenv('TERM=xterm');

推荐答案

您是否也尝试在exec语句中使用完整路径？还可以尝试添加TERM环境变量：

Have you tried using full paths in your exec statement too? Also try adding the TERM environment variable:

$ccmd = "nohup /usr/bin/sudo /usr/bin/env TERM=xterm /usr/bin/php watchdog.php " . $var . " &";

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