about set and get the some update code

public function find(&$data, $key = null, $value = null, $force = false) { $link = explode('.', $key); foreach ($link as $keys => $part) { if (isset($data[$part])) { if ($force) { if ($keys + 1 === count($link)) { $data[$part] = $value; } else { $data = &$data[$part]; } } else { $data = &$data[$part]; } } else { if ($force) { if ($keys + 1 === count($link)) { $data[$part] = $value; } else { $data[$part] = array(); $data = &$data[$part]; } } else if ($part) { return null; } } } return $data; }

public function get($key = null)
{
    if ($key === null) {
        return $this->vars;
    }
    if (is_array($key) || is_object($key)) {
        $vars = [];
        foreach ($key as $k) {

            $vars[$k] = $this->find($this->vars, $k);
        }
        return $vars;
    } else {
        return $this->find($this->vars, $key);
    }

}

public function set($key, $value = null)
{
    if (is_array($key) || is_object($key)) {
        foreach ($key as $k => $v) {
            $this->find($this->vars, $k, $v, true);
        }
    } else {
        $this->find($this->vars, $key, $value, true);
    }
}

public function has($key)
{
    return $this->find($this->vars, $key) != null;
}

public function clear($key = null)
{
    if (is_null($key)) {
        $this->vars = array();
    } else {
        $link = explode('.', $key);
        $data = &$this->vars;
        foreach ($link as $part) {
            if (isset($data[$part])) {
                $last = &$data;
                $data = &$data[$part];
            } else {
                return false;
            }
        }
        if ($last) {
            unset($last[$part]);
        }
    }

}

Sorry, forgive me for my poor English