[hellomen]

Ha! I found the error! You have a typo in one of the two variables
Have a look yourself:
$extensions
$extentions - missing a S

AAAAH fudge!
thats why I don't really like PHP XD

you are my angel

http://url4img.tk/

try it out with a JPG and a PNG

Your next step is looking into mime types and allowing / denying uploads depending on the mime type.
(Because you could have a serious vulnerability right now )
Have a look here: https://www.owasp.org/index.php/Unrestri...ile_Upload

it is accepting: image/jpg image/jpeg and image/gif which are mime types
all other types are yet blocked out...