Determines the current sort criterion.
$headers: An array of column headers in the format described in theme_table().
An associative array describing the criterion, containing the keys:
function tablesort_get_order($headers) {
$order = isset($_GET['order']) ? $_GET['order'] : '';
foreach ($headers as $header) {
if (is_array($header)) {
if (isset($header['data']) && $order == $header['data']) {
$default = $header;
break;
}
if (empty($default) && isset($header['sort']) && ($header['sort'] == 'asc' || $header['sort'] == 'desc')) {
$default = $header;
}
}
}
if (!isset($default)) {
$default = reset($headers);
if (!is_array($default)) {
$default = array(
'data' => $default,
);
}
}
$default += array(
'data' => NULL,
'field' => NULL,
);
return array(
'name' => $default['data'],
'sql' => $default['field'],
);
}