为什么Laravel会引发类似“在null中调用成员函数make（）的错误……”的错误？

Question

I have defined constant.php file inside app folder like app/constant.php . And I have defined my upload url like:

define('DIR_UPLOADS', url('/').'/uploads/');`

but it throws the following error:

Call to a member function make() on null in on line 53

I have also created a new folder named uploads and I'm using Laravel 5.1 . I have also tried composer update and composer dump-auto .

What is causing this error and how do I fix it?

Answer 1

When config files are loaded the container is not yet fully initialized. When you call url() helper, it's trying to get UrlGenerator service from the container, but the container instance does not exist yet.

You should also use Config facade to store/retrieve global settings instead of defining PHP constants.

What do you want to use this constant for? Please elaborate and I'll find a better place to put it.