}
$changed = array();
foreach ($tagschecked as $tag_id) {
if (!in_array($tagtypes[$tag_id], $existing_tagtypes)) {
//can not add new types here!!
continue;
}
// update tag type;
$tag = tag_by_id($tag_id);
$tag->tagtype = $tagtypes[$tag_id];
if (update_record('tag', $tag)) {
$changed[] = $tag_id;
}
}
if ($changed) {
$str_changed = tag_name_from_string(implode($changed, ','));
$str_changed = str_replace(',', ', ', $str_changed);
$notice = $str_changed . ' -- ' . get_string('typechanged', 'tag');
}
break;
case 'changename':
if (!data_submitted or !confirm_sesskey()) {
break;
}
$tags_names_changed = array();
foreach ($tagschecked as $tag_id) {
if ($newnames[$tag_id] != '') {
if (tag_exists($newnames[$tag_id])) {
$err_notice .= $newnames[$tag_id] . '-- ' . get_string('namesalreadybeeingused', 'tag') . '<br />';
} else {
$tags_names_changed[$tag_id] = $newnames[$tag_id];
/**
* Updates the tags associated with an item
*
* Ex 1:
* Suppose user 1 is tagged only with "algorithms", "computers" and "software"
* By calling update_item_tags('user', 1, 'algorithms, software, mathematics')
* User 1 will now be tagged only with "algorithms", "software" and "mathematics"
*
* Ex 2:
* update_item_tags('user', '1', 'algorithms, 12, 13')
* User 1 will now be tagged only with "algorithms", and with tags of ids 12 and 13
*
*
* @param string $item_type name of the table where the item is stored. Ex: 'user'
* @param string $item_id id of the item to be tagged
* @param string $tag_names_or_ids_csv comma separated tag names (can be unormalized) or ids of existing tags
* @param string $tag_type type of the tags that are beeing added (optional, default value is "default")
*/
function update_item_tags($item_type, $item_id, $tag_names_or_ids_csv, $tag_type = "default")
{
//if $tag_names_csv is an empty string, remove all tag associations of the item
if (empty($tag_names_or_ids_csv)) {
untag_an_item($item_type, $item_id);
return;
}
//convert any tag ids passed to their corresponding tag names
$tag_names_csv = tag_name_from_string($tag_names_or_ids_csv);
//associate the tags passed with the item
tag_an_item($item_type, $item_id, $tag_names_csv, $tag_type);
//get the ids of the tags passed
$existing_and_new_tags_ids = tags_id(tag_normalize($tag_names_csv));
// delete any tag instance with $item_type and $item_id
// that are not in $tag_names_csv
$tags_id_csv = "'" . implode("','", $existing_and_new_tags_ids) . "'";
$select = "\n itemid = '{$item_id}'\n AND\n itemtype = '{$item_type}'\n AND\n tagid NOT IN ({$tags_id_csv})\n ";
delete_records_select('tag_instance', $select);
}
