php CMS upload folder path issue

I am trying to create a upload system using php , the problem i m having right now is upload folder path, like , if i use

$filepath = "/images/".$filename;

it'll wont show image in admin panel but, it'll show images on home screen. if i use

$filepath = "/images/".$filename;

then image will show in admin panel but wont show up on home. i tried __DIR__ but didn't worked. kindly, help me regarding this issue.