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PHP Building Websites with PHP Slim Basics & Twig Templates Routing For Our Project

Blank page issue using slim routing

When I follow the steps how the teacher say and I obtain a blank page.

Only I need to modify the line of code that creates a instance:

$app->Slim\Slim(); //doesn''t work for me. Blank page issue $app->Slim\App(); // works well.

Is this a problem due a version of slim? I used the v3.1

If yes maybe the video need a note for the future students. I've spent more than 15 minuts for find the solution.

Thanks