php linkedin assessment answers
1. What is the best way to explain what this script does?
1 if (!$_SESSION[ 'myusername'])
2 {
3 header ('location: /login.php');
4 exit;
5 }
- This script times out the session for myusername.
- This script validates the username and password.
- This script is on a page that requires the user to be logged in. It checks to see if the user has a valid session.
- Cookies are starting to be stored as a result of this script.
2. What is a key difference between GET and POST?
- GET displays the submitted data as part of the URL. During POST, this information is not shown, as it’s encoded in the request body.
- GET is more secure than POST and should be used for sensitive information.
- GET is intended for changing the server state and it carries more data than POST.
- GET is used with the HTTP protocol. POST is used with HTTPS.
3. Which code snippet uses the correct syntax for creating an instance of the Pet class?
- all of these answers
- $horse = (new Pet) ;
- $dog = new Pet;
- $cat = new Pet();
4. What are some of the main types of errors in PHP?
- semantic, logical, syntax
- runtime, logical, compile
- notices, warnings, fatal
- warnings, syntax, compile
5. Which is the most complete list of data types that PHP supports?
- string, integer, float, boolean, array, object, NULL, resource
- string, integer, float, array, object, NULL, resource
- string, integer, boolean, array, object, NULL, resource
- string, integer, float, boolean, array, object, NULL
6. Variable names are case- ______. Function names are case- ______. Class names are case- _______.
- sensitive; insensitive; insensitive
- insensitive; sensitive; insensitive
- insensitive; insensitive; sensitive
- sensitive; sensitive; insensitive
7. Which code would you use to print all the elements in an array called $cupcakes?
- all of these answers
- foreach ($cupcakes as &$cupcake) echo $cupcake;
- var_dump ($cupcakes);
- print_r($cupcakes);
8. What are getters and setters?
- Getters and setters encapsulate the fields of a class by making them accessible only through its private methods, and keep the values themselves public.
- Getters and setters are utility functions within PHP that allow loading from, and saving to, a database.
- Getters and setters ensure that if a data member is declared private, then it can be accessed only within the same function, not by an outside class.
- Getters and setters are methods used to declare or obtain the values of variables, usually private ones.
9. Imagine a web application, built following an MVC architecture, that contains a quiz and a button to score it. When the user presses the Score button, which component should handle the request?
- model
- router
- controller
- view
10. The PHP function array reduce () takes a callback function that accepts a value carried over each iteration and the current item in the array, and reduces an array to a single value. Which code sample will sum and output the values in the provided array?
11. Both triple === and double == can be used to ______ variables in PHP. If you want to hear that string "33" and the number 33 are equal, you'd use _____. If you want to check if an array contains a particular string _____ value at a particular index, you'd use _______.
- compare; triples; doubles
- compare; doubles; triples
- assign; doubles; triples
- assign; triples; doubles
13. PHP supports multiple types of loops. If you wanted to loop through a block of code if and as long a specified condition is true, which type of loop would you use?
- for
- do-while
- foreach
- while
14. How might you troubleshoot a "call to undefined function" error?
- Make sure you have imported the file containing the function.
- all of these answers
- Make sure you have spelled the function name correctly.
- Make sure the function declaration is at an earlier point in the code than the function call.
15. Which code will return the IP address of the client?
- $_SESSION[“REMOTE_ADDR”];
- $HTTP_SERVER_VARS ( “REMOTE IP” )
- getenv ( “REMOTE_ADDR”)
- $_SERVER[ “HTTP_X_FORWARDED FOR”]
