使用PSR-4找不到类

Question

I have a PSR-4 specification in my composer.json file as below

"autoload" : {
    "psr-4" : {
        "MyMVC\\" : "app/"
    }
},

Above is my directory structure. In my Core/Config.php file i have class Config that is under namespace MyMVC\\Core . (Just taking Config class as example in question, this is same for all classes).

Now in my Config/config.php file i am using below code

<?php
use MyMVC\Core;

Config::$config['base_url'] = 'http://localhost/mymvc';

But this gives me error of Class Config Not Found. The problem can be fixed if i use MyMVC\\Core\\Config; . But it should work without using Config explicitly. Since there can be files added by the framework user which are supposed to be autoloaded.

Thanks

Answer 1

The use primitive imports or aliases a namespace or class. As the manual states:

PHP supports three kinds of aliasing or importing: aliasing a class name, aliasing an interface name, and aliasing a namespace name. PHP 5.6+ also allows aliasing or importing function and constant names.

Your use statement is "aliasing a namespace". So

use MyMVC\Core;

Is the same as:

use MyMVC\Core as Core;

Thus in your code:

Config::$config['base_url'] = 'http://localhost/mymvc';

Should be:

Core\Config::$config['base_url'] = 'http://localhost/mymvc';