Question: need help with password hash and password verification for existing users in a database. 1.showing a error msg if the the username mismatches with password

need help with password hash and password verification for existing users in a database. 1.showing a error msg if the the username mismatches with password from the database when entered via a login form. 2. hashing the the password of the preexisting user when checking the database mysql table (select*from database;)

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