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I need a function or a few lines of code that will check whether a password that has been entered contains 2 numbers and 2 letters and checks that they DONT contain characters like < > ? & $ I've already looked at that and cant find what i want not quite sure :D i've had to protect against...

Use strong validation. If the input is a number, use the is_numeric function to make sure no other characters are being inserted. Only allow data that you expect to be inserted

When i refresh a page, all of my session data is reset. I havent used unset() or session_destroy() anywhere on the page. Code $id = $_SESSION['userid']; $loggeduser = $_SESSION['user']; $userfromdb = mysql_fetch_array(mysql_query("SELECT username,id,code FROM users WHERE username='$loggeduser'...