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https://stackoverflow.com/questions/49949673/symfony-3-4-check-unique-fields-before-updating-to-the-db
https://symfony.com/doc/4.0/security/entity_provider.html
https://symfonycasts.com/screencast/symfony3-security/validation-unique-entity
https://github.com/symfony/symfony/issues/15606
https://github.com/symfony/symfony/issues/13961
https://github.com/symfony/symfony/issues/29406
https://auth0.com/blog/creating-your-first-symfony-app-and-adding-authentication/
https://www.cloudways.com/blog/symfony-api-token-authentication/
https://inchoo.net/dev-talk/symfony2-login-username-e-mail/
https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/annotations-reference.html
https://www.twilio.com/blog/2017/09/symfony-3-and-fos-user-bundle-customizing-users.html
https://www.sgalinski.de/typo3-agentur/technik/how-to-create-a-basic-form-in-symfony-2/
http://php.net/manual/de/function.array-unique.php