PHP registration script: verifying and telling the user what went wrong

Posted by Maxime on Stack Overflow See other posts from Stack Overflow or by Maxime
Published on 2010-06-01T21:42:31Z Indexed on 2010/06/01 21:53 UTC
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Hi,

I'm building a registration script and I want to insert the user's input (username, mail) ONLY if it's not already in the database. What I usually do in such cases is a request to see if something's already there, something like: "SELECT * FROM things WHERE thing_name = '$treated_user_input'".

I have two fields that need to be unique this time though. Is there a way to do only one SELECT request and still be able to tell the user exactly what field went wrong? Or do I have to do one request per unique field?

Thanks for your answers.

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