Best practice · Intermediate
Object-oriented programming
OOP: favour composition over inheritance
Your classes inherit from each other over several levels and every new feature forces yet another subclass.
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Best practices
Never store a password in plain text: hash it with Argon2
Your users' passwords are stored in plain text, MD5 or SHA-1: if the database leaks, they can be used right away.
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Question of the moment
Which are suitable for hashing passwords?
Several answers possible