Programming PHP

Example 11-9. books.xml file (continued)
1-56592-610-2
A great book!
PHP Pocket Reference
Rasmus Lerdorf
1-56592-769-9
It really does fit in your pocket
Perl Cookbook
Tom Christiansen
Nathan Torkington
1-56592-243-3
Hundreds of useful techniques, most just as applicable to
PHP as to Perl
The PHP application parses the file and presents the user with a list of books, showing
just the titles and authors. This menu is shown in Figure 11-1. The titles are links
to a page showing the complete information for a book. A page of detailed information
for Programming PHP is shown in Figure 11-2.
Figure 11-1. Book menu
We define a class, BookList, whose constructor parses the XML file and builds a list
of records. There are two methods on a BookList that generate output from that list
of records. The show_menu( ) method generates the book menu, and the show_book( )
method displays detailed information on a particular book.
Parsing the file involves keeping track of the record, which element we’re in, and
which elements correspond to records (book) and fields (title, author, isbn, and
274 | Chapter 11: XML
This is the Title of the Book, eMatter Edition
Copyright © 2002 O’Reilly & Associates, Inc. All rights reserved.