PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Implementing User Functions
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These three menu options activate the show-all-lists, show-other-lists, and
show-my-lists actions, respectively. As you have probably realized, all these actions
work quite similarly.The code for these three actions is as follows:
case 'show-all-lists':
display_items('All Lists', get_all_lists(), 'information',
'show-archive','');
break;
case 'show-other-lists':
display_items('Unsubscribed Lists',
get_unsubscribed_lists(get_email()), 'information',
'show-archive', 'subscribe');
break;
case '':
case 'show-my-lists':
display_items('Subscribed Lists', get_subscribed_lists(get_email()),
'information', 'show-archive', 'unsubscribe');
break;
As you can see, all these actions call the display_items() function from the
output_fns.php library, but they each call it with different parameters.They all also use
the get_email() function mentioned earlier to get the appropriate email address for this
user.
To see what the display_items() function does, look at Figure 30.7, the Show
Other Lists page.
Figure 30.7
The display_items() function lays out a list of the lists that
the user is not subscribed to.