PHP Slim：一个文件中的多个函数会导致错误

I am fairly new to PHP slim but it's working great for me actually. But I have a problem that I think is really strange! I have a PHP file with all my API functions to get or edit data in my database. Each of these functions works great seperatly but when I uncomment them all and they are all active I get a 404 error when I want to use them or when I surf directly to them in my browser.I am fairly new to PHP slim but it's working gr