Horde_Registry::listAPIs PHP Method

    public function listAPIs()
    {
        if (empty($this->_apiList) && !empty($this->_interfaces)) {
            $apis = array();
            foreach (array_keys($this->_interfaces) as $interface) {
                list($api, ) = explode('/', $interface, 2);
                $apis[$api] = true;
            }
            $this->_apiList = array_keys($apis);
        }
        return $this->_apiList;
    }