ch7 questions

Question 1

Which printf conversion specifier would you use to display a floating-point number?

Answer 1

%f

Question 2

What printf statement could be used to take the input string “Happy Birthday” and output the string “**Happy”?

Answer 2

printf(“%’*7.5s”, “Happy Birthday”);

Question 3

To send the output from printf to a variable instead of a browser, what alternative function would you use?

Answer 3

sprintf()

Question 4

How would you create a Unix timestamp for 7:11 a.m. on May 2, 2016?

Answer 4

$timestamp = mktime(7,11,0,5,2,2016);

Question 5

Which file access mode would you use with open to open a file in write and read mode, with the file truncated and the file pointer at the start?

Answer 5

fopen(“file.txt”, ‘w+’);

Question 6

What is the PHP command for deleting the file file.txt?

Answer 6

unlink(‘file.txt’);

Question 7

Which PHP function is used to read an entire file in one go, even from across the web?

Answer 7

file_get_contents();

Question 8

Which PHP superglobal variable holds the details on uploaded files?

Answer 8

$_FILES

Question 9

Which PHP function enables the running of system commands?

Answer 9

exec

Question 10

Which of the following tag styles is preferred in HTML5: <hr> or <hr>?

Answer 10

<hr></hr>