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Your users' passwords are the lowest barrier of entry into your user account system.
A week password opens up the ability for bad actors to infiltrate your users accounts.
So you have to help them protect themselves by enforcing minimum password requirements.
Here we create a function that you can use to validate a password in PHP. We create minimum requirements, including having 6 characters or more, at least one lowercase letter, at lease one uppercase letter, at least one digit, and at least one special character.
We use a combination of length checking and regular expressions to validate a password.