The best way to secure PHP + MYSQL data

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I'm building an app that will store some of our clients details, things like usernames / passwords, information that we need to remember and keep secure.

What's the best method for storing this information securely?


Such an open-ended question with not a lot of detail to go on. I'd suggest reading Chris Shiflett's excellent "Essential PHP Security" before you go any further. It's short, to the point and very practical.

There's also a reasonable amount of the advice available from the book's website too at http://phpsecurity.org/