Wolfgang Blessen questions

Wolfgang Blessen answers

• PHP Fatal error: Default value for parameters with a class type hint can only be NULL in /usr/share/php/Symfony/Component/
• Convert OpenSSH ED25519 Private Key Format to PEM format
• Chromium and Firefox display colors differently and I don't know which one is doing it right
• disabled styling for DIV element [duplicate]
• Properly handle PHPStorm's "multiple definitions exist for class"
• What will be the best practice of code separating for a large projects in Symfony4?