web development exercise 5 2
Exercise 5-2_x000D_ In this project, you will create a Web page that allows visitors to your_x000D_ site to sign a guest book that is saved to a text ï¬le. Ensure that the_x000D_ Projects directory has read and write permissions for everyone.
1. Create a new document in your text editor and type the_x000D_
declaration, element, document head, and_x000D_
element. Use the strict DTD and “Guest Book†as the_x000D_
content of the element.
2. Add the following text and elements to the document body:_x000D_
Enter your name to sign our guest book_x000D_
_x000D_
First Name _x000D_
Last Name
Show Guest Book_x000D_
_x000D_
_x000D_
3. Save the document as GuestBook.html in the Projects direc-_x000D_
tory for Chapter 5._x000D_
_x000D_
4. Create a new document in your text editor and type the_x000D_
declaration, element, document head, and_x000D_
element. Use the strict DTD and “Sign Guest Book†as_x000D_
the content of the element._x000D_
_x000D_
5. Add the following script section to the document body:_x000D_
_x000D_
_x000D_
6. Add the following if statement to the script section to check_x000D_
whether the user ï¬lled in the ï¬rst name and last name ï¬elds:_x000D_
if (empty($_POST['ï¬rst_name']) || empty($__x000D_
POST['last_name']))_x000D_
echo "You must enter your ï¬rst and last_x000D_
name. Click your browser's Back button to_x000D_
return to the Guest Book.n";_x000D_
_x000D_
7. Add the following else clause to the end of the script section._x000D_
The statements in the else clause use the fwrite() function_x000D_
to add visitor names to a text ï¬le named guestbook.txt._x000D_
else {_x000D_
$FirstName = addslashes($_POST['ï¬rst_name']);_x000D_
$LastName = addslashes($_POST['last_name']);_x000D_
$GuestBook = fopen("guestbook.txt", "ab");_x000D_
if (is_writeable("guestbook.txt")) {_x000D_
if (fwrite($GuestBook, $LastName . ", " ._x000D_
$FirstName . "n"))_x000D_
echo "Thank you for signing our_x000D_
guest book!n";_x000D_
else_x000D_
echo "Cannot add your name to the_x000D_
guest book.n";_x000D_
}
else_x000D_
echo "Cannot write to the ï¬le.n";_x000D_
fclose($GuestBook);_x000D_
}_x000D_
_x000D_
8. Save the document as SignGuestBook.php in the Projects_x000D_
directory for Chapter 5._x000D_
291_x000D_
9. Create a document named ShowGuestBook.php that dis-_x000D_
plays the names of visitors who have signed the guest book._x000D_
Use the readï¬le() function to display the contents of the_x000D_
guestbook.txt ï¬le. Note that you will need to use the _x000D_
element for Web browsers to recognize the line breaks._x000D_
_x000D_
10. Open GuestBook.html in your Web browser by enter-_x000D_
ing the following URL: http:///PHP_Projects/_x000D_
Chapter.05/Projects/GuestBook.html. Test the form to see if_x000D_
you can write data to and read data from the guestbook.txt_x000D_
ï¬le._x000D_
_x000D_
11. Close your Web browser window._x000D_
