Zmień linię 168, czyli
if($img_type[$w] == 'image/jpg' or $img_type[$w] == 'image/JPG' or $img_type[$w] == 'image/jpeg' or $img_type[$w] == 'image/JPEG') {
na
if($img_type[$w] == 'image/jpg' or $img_type[$w] == 'image/JPG' or $img_type[$w] == 'image/jpeg' or $img_type[$w] == 'image/JPEG' or $img_type[$w] == 'image/pjpeg') {
oraz linię 148
if($primary_type == 'image/jpg' or $primary_type == 'IMAGE/JPG' or $primary_type == 'image/jpeg' or $primary_type == 'IMAGE/JPEG') {
na
if($primary_type == 'image/jpg' or $primary_type == 'IMAGE/JPG' or $primary_type == 'image/jpeg' or $primary_type == 'IMAGE/JPEG' or $primary_type == 'image/pjpeg') {
Nie jestem pewien czy któraś z linii mi jeszcze nie umknęła, ogólnie chodzi o dodanie
image/pjpeg.