缩小图片比例大小和占用空间

$resource_path = env('APP_URL') . $hotel->hero_image;
$name = explode('.', $resource_path);

if(!file_exists('upload/hotel/thumb/'.$id.'.'.$name[2]))

{

    $s_size = getimagesize($resource_path);

    $s_height = $s_size[1];

    $s_width = $s_size[0];

    $d_height = $s_size[1]/3;

    $d_width = $s_size[0]/3;
    $dest = imagecreatetruecolor($d_width, $d_height);
    if (strpos($name[2],'png')!==false){
        $source = imagecreatefrompng($resource_path);
        imagecopyresized($dest, $source, 0, 0, 0, 0, $d_width, $d_height, $s_width, $s_height);

        imagepng($dest,'upload/hotel/thumb/'.$id.'.'.$name[2],1);
    }else{
        $source = imagecreatefromjpeg($resource_path);
        imagecopyresized($dest, $source, 0, 0, 0, 0, $d_width, $d_height, $s_width, $s_height);

        imagejpeg($dest,'upload/hotel/thumb/'.$id.'.'.$name[2],100);
    }

}