.
// represents a categorization of students
//
abstract class Categorization {
abstract function name();
// returns descriptive name
abstract function categories();
// returns list of categories
abstract function categorize($user);
// returns a student's category
}
class CatSex extends Categorization {
function name() {
return "Sex";
}
function categories() {
return array ("Male", "Female", "Unknown");
}
function categorize($user) {
switch ($user->bolt->sex) {
case 1: return "Male";
case 2: return "Female";
default: return "Unknown";
}
}
}
$x = localtime(time(), true);
$this_year = 1900 + $x['tm_year'];
class CatAge20 extends Categorization {
function name() {
return "Age (20-year groups)";
}
function categories() {
return array("0-19", "20-39", "40-59", "60-79", "80+", "Unknown");
}
function categorize($user) {
if (!$user->bolt->birth_year) return "Unknown";
global $this_year;
$n = $this_year - $user->bolt->birth_year;
if ($n < 20) return "0-19";
if ($n < 40) return "20-39";
if ($n < 60) return "40-59";
if ($n < 80) return "60-79";
return "80+";
}
}
$categorizations = array(new CatSex(), new CatAge20());
function lookup_categorization($name) {
global $categorizations;
foreach ($categorizations as $c) {
if ($c->name() == $name) return $c;
}
return null;
}
function filter_form($sel_name, $sel_cat) {
global $categorizations;
$checked = (!$sel_name || $sel_name == "none")?"checked":"";
echo "
Filter by:
";
}
function breakdown_form($sel_name) {
global $categorizations;
$checked = (!$sel_name || $sel_name == "none")?"checked":"";
echo "
Break down by:
";
}
// return filter and breakdown info for URLs
//
function filter_url() {
global $filter, $filter_cat, $breakdown, $breakdown_cat;
$x = "";
if ($filter && $filter_cat) {
$x .= "&filter=".$filter->name.":$filter_cat";
}
if ($breakdown && $breakdown_cat) {
$x .= "&breakdown=".$breakdown->name.":$breakdown_cat";
}
return $x;
}
// get filter and breakdown from form vars
//
function get_filters_from_form() {
global $breakdown, $breakdown_cat, $filter, $filter_cat;
$breakdown_cat = null;
$breakdown_info = get_str('breakdown', true);
if ($breakdown_info && $breakdown_info != 'none') {
$arr = explode(":", $breakdown_info);
$breakdown_name = $arr[0];
if (count($arr) == 2) {
$breakdown_cat = $arr[1];
}
$breakdown = lookup_categorization($breakdown_name);
if (!$breakdown) error_page("unknown breakdown $breakdown_name");
} else {
$breakdown = null;
}
$filter_info = get_str('filter', true);
if ($filter_info && $filter_info != "none") {
$arr = explode(":", $filter_info);
$filter_name = $arr[0];
$filter_cat = $arr[1];
$filter = lookup_categorization($filter_name);
if (!$filter) error_page("unknown filter $filter_name");
} else {
$filter_cat = "";
$filter = null;
}
}
?>