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Not to be a debbie downer, but the specific login script you mention uses MD5. If your website's password security is important, to you, please read "no one should be using MD5 anymore" at https://en.wikipedia.org/wiki/MD5 (MD5 is broken). From what I understand, php's built in "password_hash" function is much, much better than MD5. If you please read the question and answer about the "password_hash" function here. you might be inclined to go ahead and use mySQL. There are some pre-written login scripts on the net using "password_hash" that even I (a total PHP dumbo) can understand (just google "simple password_hash login scripts"). Just a thought.