posix_kill 与 pcntl_signal
这有点深奥，这个问题可能不会得到解答，直到我自己浏览源代码并回答它，但这里是：
我是一个简单的 PHP 守护程序库的作者：https://github.com/shaneharter/PHP-Daemon。虽然 PHP 对于此类事情并不理想，但有时人们需要在 PHP 中守护或编写 cron，并编写库以使“新手”更容易完成该任务。
我正在为该库实现 JavaScript Workers API，并且正在考虑添加对 POSIX 的依赖项（现在它正在使用 PCNTL 完成所有操作）。
有人知道 PCNTL_SIGNAL 和 POSIX_KILL 之间有什么区别吗？我可以使用其中任何一个向任何进程发送任何信号。那么……一个比另一个更好吗？或者他们实际上都在幕后做着同样的事情？
This is a bit esoteric and it's possible this question will go unanswered until I troll the the source myself and answer it, but here goes:
I'm the author of a simple PHP Daemon library: https://github.com/shaneharter/PHP-Daemon. While PHP isn't ideal for this sort of thing, sometimes people need to daemonize or write crons in PHP and wrote the library to make that task a lot easier on the "uninitiated."
I'm implementing the JavaScript Workers API for the library and I'm considering adding a dependency on POSIX (right now it's doing everything with PCNTL).
Does anybody know what the difference is between PCNTL_SIGNAL and POSIX_KILL? I can use either to send any signal to any process. So.... is one better than the other? Or are they both really doing the same thing under the hood?
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posix_kill()用于向进程发送信号。pcntl_signal()用于监听调用进程（您的脚本）接收到的信号。请参阅此处的示例。
posix_kill()is used to send a signal to a process.pcntl_signal()is used to listen for signals received by the calling process (your script).See the examples here.