codeigniter无法访问受保护的属性MY_Loader :: $ _ ci_cached_vars

Question

After upgrade of Codeigniter i get this message

Cannot access protected property MY_Loader::$_ci_cached_vars

i know that this property is now protected so i change

else if (isset($CI->load->_ci_cached_vars[$key]))
    {
        $val = $CI->load->_ci_cached_vars[$key];
    }

to

if (isset($CI->load->get_var($key)))
    {
        $val = $CI->load->get_var($key);
    }

but then i get

Can't use method return value in write context

this is get_var method

/**
     * Get Variable
     *
     * Check if a variable is set and retrieve it.
     *
     * @param   array
     * @return  void
     */
    public function get_var($key)
    {
        return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;
    }

what can i do, just use

if ($CI->load->get_var($key)) != null)  {
        $val = $CI->load->get_var($key);
    }

without isset? i want to check if is not NULL, becouse get_var method return null

or is if ($CI->load->get_var($key))) { check enough?

Answer 1

You cannot use isset on a function

ie $CI->load->get_var($key) will always return "something" - but what that "something" is depends.

So you are correct - the code below will achieve your goal. If the function returns "null" - then isset already failed. If the function returns something else (besides null) - then you will have a valid return.

if ($CI->load->get_var($key)) != null)  {
        $val = $CI->load->get_var($key);
    }