SlightPHP\Db::init PHP Method

    public function init($params)
    {
        if (is_object($params)) {
            $params = (array) $params;
        }
        if (!isset($params['engine']) || !in_array($params['engine'], $this->_allow_engines)) {
            $params['engine'] = $this->_engine_name;
        } else {
            $this->__setEngine($params['engine']);
        }
        $this->_key = implode("|", $params);
        if (!isset(Db::$_globals[$this->_key])) {
            if ($this->_engine_name == "mysql") {
                require_once SLIGHTPHP_PLUGINS_DIR . "/db/DbMysql.php";
                $this->engine = new \SlightPHP\DbMysql($params);
            } elseif ($this->_engine_name == "mysqli") {
                require_once SLIGHTPHP_PLUGINS_DIR . "/db/DbMysqli.php";
                $this->engine = new \SlightPHP\DbMysqli($params);
            } else {
                require_once SLIGHTPHP_PLUGINS_DIR . "/db/DbPDO.php";
                $this->engine = new \SlightPHP\DbPDO($params);
            }
            $this->engine->init($params);
            if ($this->engine->connect() === false) {
                $this->error['code'] = $this->engine->errno();
                $this->error['msg'] = $this->engine->error();
                if (defined("DEBUG")) {
                    trigger_error("{$this->_engine_name} ( " . var_export($this->error, true) . ")");
                }
                unset(Db::$_globals[$this->_key]);
                return false;
            } else {
                Db::$_globals[$this->_key] = $this->engine;
            }
        } else {
            $this->engine = Db::$_globals[$this->_key];
        }
        return true;
    }