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

724 Chapter 30 Building a Mailing List Manager
Listing 30.14 Continued
return false;
}
$query = "select count(*) from lists where listname = '".$details['name']."'";
$result = $conn->query($query);
$row = $result->fetch_array();
if($row[0] > 0) {
echo "Sorry, there is already a list with this name.";
return false;
}
$query = "insert into lists values (NULL,
'".$details['name']."',
'".$details['blurb']."')";
$result = $conn->query($query);
return $result;
}
}
This function performs a few validation checks before writing to the database: It checks
that all the details were supplied, that the current user is an administrator, and that the
list name is unique. If all goes well, the list is added to the lists table in the database.
Uploading a New Newsletter
Finally, we come to the main thrust of this application: uploading and sending newsletters
to mailing lists.
When an administrator clicks on the Create Mail button, the create-mail action is
activated, as follows:
case 'create-mail':
display_mail_form(get_email());
break;
The administrator then sees the form shown in Figure 30.12.