Time limit between searches?

[mdb]

Oh sorry I didn't mean for mybb's thread searches, but for a seperate query i'm adding.

I found this on the internet but am a little confused by it:

PHP Code:

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session_start() if(isset($_SESSION['ip']) && $_SESSION['last_search'] + 30 < time()) die('too early'); $_SESSION['last_search'] = time(); $_SESSION['ip'] = $_SERVER['REMOTE_ADDR']; // store the message

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Could someone explain to me if that's the method I would use to store a persons last search time, and also how I could use that to add a check using that method for if a person made a search within the last 30 seconds, and if they did itll echo them some message, if not they can continue?