Linkedin PHP Assessment Cevapları

Soru 1: What is the best way to explain what this script does?

if (!$_SESSION['myusername'])
{
    header('locaton: /login.php');
    exit;
}

• This script times out the session for myusername.
• 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.
• This script validates the username and password.

Soru 2: Which operator would you use to find the remainder after division?

• /
• %
• //
• DIV

Soru 3: What is the purpose of adding a lowercase “u” as a modifier after the final delimiter in a Perl-compatible regular expression?

• It makes the dot metacharacter match anything, including newline characters.
• It makes the pattern match uppercase letters.
• It inverts the greediness of the quantifiers in the pattern so they are not greedy by default.
• Both the pattern and subject string are treated as UTF-8.

Soru 4: What is the value of $total in this calculation?

$total = 2 + 5 * 20 - 6 / 3

• 44
• 138
• 126
• 100

Soru 5: Which value equates to true?

• 0
• NULL
• -1
• ”

Soru 6: What is a key difference between GET and POST?

• GET is used with the HTTP protocol. POST is used with HTTPS.
• 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 intended for changing the server state and it carries more data than POST.
• GET is more secure than POST and should be used for sensitive information.

Soru 7: Which are valid PHP error handling keywords?

• try, throw, catch, callable
• try, throw, catch, finally
• try, yield, catch, finally
• yield, throw, catch, finally

Soru 8: The _ operator is useful for sorting operations. It compares two values and returns an integer less than, equal to, or greater than 0 depending on whether on whether the value on the ___is less than, equal to, or greater than the other.

• greater-than; right
• equality; right
• spaceship; left
• comparison; left

Soru 9: In the following script, which line(s) will cause an error(s)?

<?php
       $count = 0
       $_xval = 5
       $_yval = 1.0
       $some_string = "Hello there!";
       $some_string = "How are you?";
       $will i work = 6;
       $3blindmice = 3;
 ?>

• Line 6 will cause an error because you can’t reassign a new value to a variable that has already been set.
• Line 5 will cause an error because some_string should be someString.
• Line 3 and 4 will cause an error because a variable cannot start with an underscore(_).
• Line 7 and 8 will cause an error. Line 7 has whitespace in $will i work and should be $will_i_work. Line 8 cannot start with a number befcause it is a variable.

Soru 10: What does this script do?

$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);
if ($email === false) {
  $emailErr = "Please re-enter valid email";
}

• It makes sure the email address is a good and functioning address
• It makes an email safe to input into a database
• It assigns an email to a variable and then removes all illegal characters from the $email variable
• It verifies that an email address is well formed.

Soru 11: Which code snippet uses the correct syntax for creating an instance of the Pet class?

• $dog = new Pet;
• $horse = (new Pet);
• $cat = new Pet();
• All of these answers

Soru 12: Which is the correct format for adding a comment to a PHP script?

• #This is a comment
• /* This is a comment /*
• // This is a comment
• All of these answers

Soru 13: What is missing from this code, which is supposed to create a test cookies?

1 $string_name = " testcookie";
2 $string_value = "This is a test cookie";
3 $expiry_info = info()+259200;
4 $string_domain = "localhost.localdomain";

• The $_REQUEST is missing.
• The call to setcookie() is missing.
• The $_COOKIES array is missing.
• The cookie session is missing.

Soru 14: All variables in PHP start with which symbol?

• &
• %
• _
• $

Soru 15: In a conditional statement, you want to execute the code only if both value are true. Which comparison operator should you use?

• ||
• &&
• &
• <=>