codeigniter 3 query check if file exists code example

Example: codeigniter check view file exists

class MY_Loader extends CI_Loader
{
    public function view($view, $vars = array(), $return = FALSE)
    {

        foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val)
        {
            $$_ci_val = isset($_ci_data[$_ci_val]) ? $_ci_data[$_ci_val] : FALSE;
        }

        $file_exists = FALSE;

        // Set the path to the requested file
        if (is_string($_ci_path) && $_ci_path !== '')
        {
            $_ci_x = explode('/', $_ci_path);
            $_ci_file = end($_ci_x);
        }
        else
        {
            $_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);
            $_ci_file = ($_ci_ext === '') ? $_ci_view.'.php' : $_ci_view;

            foreach ($this->_ci_view_paths as $_ci_view_file => $cascade)
            {
                if (file_exists($_ci_view_file.$_ci_file))
                {
                    $_ci_path = $_ci_view_file.$_ci_file;
                    $file_exists = TRUE;
                    break;
                }

                if ( ! $cascade)
                {
                    break;
                }
            }
        }

        if ( ! $file_exists && ! file_exists($_ci_path))
        {
            throw new Exception('View file '.$view.' doesn\'t exist.');
        }
        return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_prepare_view_vars($vars), '_ci_return' => $return));
    }

}