Download e-book for kindle: An introduction to functional programming through by Greg Michaelson

By Greg Michaelson

ISBN-10: 0201178125

ISBN-13: 9780201178128

Sensible programming is rooted in lambda calculus, which constitutes theВ world's smallest programming language. This well-respected textual content bargains an available advent to sensible programming techniques and strategies for college students of arithmetic and machine technology. The therapy is as nontechnical as attainable, and it assumes no previous wisdom of arithmetic or sensible programming. Cogent examples light up the imperative principles, and diverse workouts seem during the textual content, providing reinforcement of key thoughts. All difficulties characteristic entire suggestions

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Let’s now look at the methods that login uses. php (in SPLIB) (excerpt) /** * Sets the session variables after a successful login * @return void * @access protected */ function storeAuth($login, $password) { $this->session->set(USER_LOGIN_VAR, $login); $this->session->set(USER_PASSW_VAR, $password); // Create a session variable to use to confirm sessions $hashKey = md5($this->hashKey . $login . $password); $this->session->set('login_hash', $hashKey); } The storeAuth method is used to add the user name and password to the session, along with a hash value.

If the request were sent by, for instance, a Perl script pretending to be a Web browser, whoever was using the script would, no doubt, have total control over its behavior and could quite easily ignore the instruction to redirect elsewhere. Hence, the exit statement is critical. Overall, this approach helps save us from our own mistakes; if a given user is not valid, script execution halts and the user is redirected to another “safe” page. The alternative approach might be to build conditional statements into a page, like this: if ($auth->login()) { echo 'You are logged in'; } else { echo 'Invalid login'; } However, this isn’t really a good idea.

How do I build a user registration system? Having an authentication system is fine, but how do you fill it with users in the first place? If only yourself and a few friends will access your site, you can probably create accounts for all users through your database administration interface. However, for a site that’s intended to become a flourishing community to which anyone and everyone is free to sign up, you’ll want to automate this process. You’ll want to allow visitors to register themselves, but you’ll probably still need some level of “screening” so that you have at least a little information about the people who have signed up (such as a way to confirm their identity).

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An introduction to functional programming through lambda-calculus by Greg Michaelson

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