public static function resolve_category_by_idnumber($idnumber) {
        global $DB;
        $cache = cache::make('tool_uploadcourse', 'helper');
        $cachekey = 'cat_idn_' . $idnumber;
        if (($id = $cache->get($cachekey)) === false) {
            $params = array('idnumber' => $idnumber);
            $id = $DB->get_field_select('course_categories', 'id', 'idnumber = :idnumber', $params, IGNORE_MISSING);

            // Little hack to be able to differenciate between the cache not set and a category not found.
            if ($id === false) {
                $id = -1;
            }

            $cache->set($cachekey, $id);
        }

        // Little hack to be able to differenciate between the cache not set and a category not found.
        if ($id == -1) {
            $id = false;
        }

        return $id;
    }
public static function resolve_category_by_idnumber($idnumber) {
        global $DB;
        $cache = cache::make('tool_uploadcourse', 'helper');
        $cachekey = 'cat_idn_' . $idnumber;
        if (($id = $cache->get($cachekey)) === false) {
            $params = array('idnumber' => $idnumber);
            $id = $DB->get_field_select('course_categories', 'id', 'idnumber = :idnumber', $params, IGNORE_MISSING);

            // Little hack to be able to differenciate between the cache not set and a category not found.
            if ($id === false) {
                $id = -1;
            }

            $cache->set($cachekey, $id);
        }

        // Little hack to be able to differenciate between the cache not set and a category not found.
        if ($id == -1) {
            $id = false;
        }

        return $id;
    }
public static function resolve_category_by_idnumber ( $ idnumber ) { global $ DB ; $ cache = cache :: make ( 'tool_uploadcourse' , 'helper' ) ; $ cachekey = 'cat_idn_' . $ idnumber ; if ( ( $ id = $ cache -> get ( $ cachekey ) ) === false ) { $ params = array ( 'idnumber' => $ idnumber ) ; $ id = $ DB -> get_field_select ( 'course_categories' , 'id' , 'idnumber = :idnumber' , $ params , IGNORE_MISSING ) ; // Little hack to be able to differenciate between the cache not set and a category not found. if ( $ id === false ) { $ id = - 1 ; } $ cache -> set ( $ cachekey , $ id ) ; } // Little hack to be able to differenciate between the cache not set and a category not found. if ( $ id == - 1 ) { $ id = false ; } return $ id ; }
Resolve a category by ID number.

@param string $idnumber category ID number.
@return int category ID.
Resolve a category by ID number .