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

Implementing User Functions
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Listing 30.8
Continued
for($i = 0; $ifetch_array();
array_push($list, array($row[0], $row[1]));
}
}
return $list;
}
As you can see, this function requires an email address passed into it.This should be the
email address of the subscriber that you are working with.The
get_subscribed_lists() function also requires an email address as a parameter, but the
get_all_lists() function does not for obvious reasons.
Given a subscriber’s email address, you connect to the database and fetch all the lists
the subscriber is not subscribed to.You use a LEFT JOIN to find unmatched items, and
you loop through the result and build the array row by row using the array_push()
built-in function.
Now that you know how this list is produced, let’s look at the action buttons associated
with these displays.
Viewing List Information
The Information button shown in Figure 30.7 triggers the information action, which is
as follows:
case 'information':
display_information($_GET['id']);
break;
To see what the display_information() function does, look at Figure 30.8.
This function displays some general information about a particular mailing list and lists
the number of subscribers and number of newsletters sent out to that list and available in
the archive (more on that shortly).The code for this function is shown in Listing 30.9.
Listing 30.9 display_information()Function from output_fns.php—This
Function Displays List Information
// diplay stored information about each list
function display_information($listid) {
if(!$listid) {
return false;
}
$info=load_list_info($listid);