src/SpeedUpEssentials/Helper/Spritify.php
private function total_size() {
        $arr = array("width" => 0, "height" => 0);
        foreach ($this->images as $image) {
            if ($arr["width"] < $image["width"]) {
                $arr["width"] = $image["width"];
            }
            $arr["height"] += $image["height"];
        }
        return $arr;
    }
private function total_size() {
        $arr = array("width" => 0, "height" => 0);
        foreach ($this->images as $image) {
            if ($arr["width"] < $image["width"]) {
                $arr["width"] = $image["width"];
            }
            $arr["height"] += $image["height"];
        }
        return $arr;
    }
calculates width and height needed for sprite image