运行电子邮件列表脚本时来自 Cron 守护程序的额外电子邮件
我有一个 PHP 脚本，每两周向订阅者发送一次提醒。每次发送电子邮件时，它也会发送一封来自“Cron Daemon”的电子邮件。当我第一次编写脚本时，它没有发送这封电子邮件，但现在它发送了。我对此有几个问题。
这封电子邮件的内容是这样的：
Set-Cookie: PHPSESSID=((random letters and numbers here)); path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-type: text/html
- 这封电子邮件是什么意思？
- 为什么要发送这封电子邮件？
- 有没有办法阻止票据发送这封电子邮件？
I have a PHP script that sends out a bi-weekly reminder to subscribers. Each time it sends out the email it also sends out an email that comes in from "Cron Daemon." When I first wrote the script, it didn't send this email, but now it does. I have a few questions about this.
This is what the email says:
Set-Cookie: PHPSESSID=((random letters and numbers here)); path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-type: text/html
- What does this email mean?
- Why is this email being sent?
- Is there a way to stop the scrip from sending this email?
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Cron 读取执行命令的 stdout/stderr，如果写入了内容，则 cron 发送一封电子邮件。
我猜 php 可执行文件被编译为“cgi”或“fcgi”，因此它默认发出这些标头。
为了解决这个问题，你显然有三种可能的解决方案：
> /dev/null 2>&1附加到你的 cron 命令）。MAILTO=""（请参阅 本页）。Cron reads the stdout/stderr of the command that gets executed, if something is written then cron sends an E-Mail.
I guess the php-executable is compiled as "cgi" or "fcgi" so it emits those headers by default.
To solve this you have apparently three possible solutions:
> /dev/null 2>&1to your cron command).MAILTO=""(see this page).我的猜测是你的 PHP 脚本正在向输出渲染一些内容。如果有任何内容被渲染，cron 会将其转发到默认管理员电子邮件。
有两种解决方案：
1) 修复 PHP 脚本，使其根本不输出任何内容。这有时比看起来更困难，尤其是对于不平凡的脚本。
2) 防止 cron 脚本永远有输出。此方法的缺点是当脚本失败时您也不会收到通知。要停止输出，请使用类似以下内容：
My guess is your PHP script is rendering something to the output. If anything gets rendered at all, cron forwards that to the default administrator email.
There's two solutions to this:
1) Fix your PHP script to not output anything at all. This is sometimes harder than it would seem, especially for non-trivial scripts.
2) Prevent the cron script from ever having an output. The drawback to this method is you won't get a notice when the script fails, either. To stop the output, use something like this: