composer php - PHP Include class by using "use" with PSR-4 -

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i'm using psr-4, defined psr-4 section on composer.json

"autoload": {         "classmap":[                         ],                   "psr-4": {             "app\\": "app/"                  } },

when tried import class using "use" keyword

use app\http\controllers\controller;

i error: fatalerrorexception in uploadfilescontroller.php line 13: class 'controllers\controller' not found

if set static route file 

include("c:\xampp\...");

it works, after found same problem other files including php clases illuminate.

what's problem?


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