Best practice for storing usernames & password in MySQL Databases [duplicate]
For the password hash use PBKDF2 it's NIST approved. You should use a random non-secret salt for each password and nontrivial (over 1000) iteration count.
For the username and email, probably not worth encrypting.
The best practices IMO are:
Use a hashing algorithm such as SHA256 or SHA512. MD5 is insecure now as you can reverse the hash/perform a rainbow attack.
Use a strong salt to ensure an attacker cannot guess commonly hashed passwords if they ever gained entry to your database.
Do not use encryption.
Only hash the passwords, usernames and e-mails are fine as plain text.
It's only really the password that you need encrypting. Realistically, you should be both Hashing (that's what you mean when you say encoding) in an algorithm at least SHA-256 really (I'm pretty sure MD5 and SHA1 are crackable?) AND Salting your passwords to be extra safe.
Here's an answer on the preferred method of storing them: Preferred Method of Storing Passwords In Database