public function getIconString($icon, $class = '', $width = '', $height = '')
    {
        $string = $this->loadFile(__DIR__.'/../../resources/assets/icons/'.$icon.'.svg');
        $string = substr_replace($string, ' class="'.$class.'"', 4, 0);

        if ($width) {
            $string = substr_replace($string, 'width="'.$width.'"', strpos($string, 'width='), 10);
            $string = substr_replace($string, 'height="'.$height.'"', strpos($string, 'height='), 11);
        }

        return $string;
    }