CSCI 2910 PHP Sessions and Security Quiz Answers and Explanations - Prof. David L. Tarnoff, Quizzes of Computer Science

Download CSCI 2910 PHP Sessions and Security Quiz Answers and Explanations - Prof. David L. Tarnoff and more Quizzes Computer Science in PDF only on Docsity! CSCI 2910 PHP Sessions and Security Quiz Name: ________________________________ Spring 2007 1. For lower traffic sites, sessions can be kept track of with a text file. High traffic sites, however, should use a(n) ________________ to keep track of sessions. (1 point) 2. To start a new session explicitly, the function ____________ should be called. (1 point) a.) session_start() b.) get_session() c.) new Session() d.) find_session() e.) session_open() 3. To open an existing session, the function ____________ should be called. (1 point) a.) session_start() b.) get_session() c.) new Session() d.) find_session() e.) session_open() Questions 4 and 5 are based on the following 'snippet' of PHP code. Note that the numbers on the left have been added as a reference to line numbers and are not part of the code. 1: if(!isset($_SESSION['count'])) 2: { 3: $_SESSION['count'] = 0; 4: $_SESSION['name'] = $_POST['user_name']; 5: } 6: $_SESSION['count']++; 4. What condition causes the returned value of isset() in line 1 to be false? (2 points) 5. If this piece of code is accessed 25 times during a client's session, how often was line 6 executed for this client? (1 point) a.) never b.) one time c.) 24 times d.) 25 times 6. True or False: A session variable can be of any type or object (1 point) 7. There are two ways to remove session variables. One is to remove them individually using unset(). The second method is to remove them all at once. How is the second one achieved? (2 points) 8. Define only two of the following three superglobal variables. (4 points) $_SERVER['HTTP_REFERER']: $_SERVER['REQUEST_METHOD']: $_SERVER['REMOTE_ADDR']: