A. array_add()
B. array_merge()
C. array_join()
D. array_combine()
29. What function is used to determine whether a session has been started for the current user and then start one if necessary? __________ (Fill in the blank.)
30. After opening a file with the fopen() function, what is used to close the file pointer?
A. fclose()
B. close()
C. die()
D. end()
31. Which of the following functions can be used to show the data type for the $remain variable?
A. echo show($remain);
B. echo gettype($remain);
C. echo type($remain);
D. echo explain($remain);
32. Which of the following functions removes a directory from a file system?
A. rmdir()
B. dir()
C. del()
D. dir_gone()
33. What is the difference between sleep() and usleep()?
A. sleep() suspends operations and usleep() resumes them
B. sleep() accepts seconds and usleep() accepts milliseconds
C. sleep() works for the current process and usleep() works for all processes
D. sleep() can only be specified for the current user and usleep() can be specified for all users
34. You need to know how many elements are in an array. What function should you use to count this?
A. list()
B. count()
C. number()
D. sizeof()
35. Information about a session, by default, is configured in the PHP configuration file to be saved beneath which directory?
A. /var
B. /etc
C. /tmp
D. /usr
36. Which of the following contains variables provided to a script by means of the server environment?
A. $_FILES
B. $_POST
C. $_GET
D. $_ENV
37. Which of the following can be used to delete a file?
A. delete()
B. rid()
C. unlink()
D. close()
38. Which of the following functions can be used to destroy a variable?
