在PHP中包含文件时可以使用$ _GET变量吗？是否有可能，即使是从AJAX呼叫？

I have a PHP file that handles sending out confirmation emails. I also have a calendar that I use AJAX to do various updates. When AJAX calls the update file, it updates the database with the new information, and I want confirmation emails to be sent out.I have a PHP file that handles sending out conf