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https://openclassrooms.com/forum/sujet/probleme-notice-undefined-index-login-55209
https://stackoverflow.com/questions/7947646/undefined-index-in-php-login-script
https://www.commentcamarche.net/forum/affich-22913517-notice-undefined-index-login
https://www.developpez.net/forums/d541852/php/langage/debuter/erreur-niveau-session-notice-undefined-index-login/
http://www.phpdebutant.org/article148.php
https://forums.futura-sciences.com/programmation-langages-algorithmique/640855-php-probleme-notice-undefined-index.html
https://www.drupal.org/project/panelizer/issues/2976059
https://www.sitepoint.com/community/t/undefined-index-username/271591