Any way to retrieve hotlink url?

[ChoboSeki]

Say somebody shows one of my images on their website (the image is generated by PHP and uses the IMG tag)

My log file shows:

"GET /usercode-8.png HTTP/1.1" 200 2007 -----.com "http://----.org/user.php?i=2300" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b4)

Green: The image which is hotlinked
Blue: The "referer" / link that has the image hotlinked

Is there any way to get the referer by PHP?

I tried $HTTP_REFERER and $_SERVER['HTTP_REFERER'] and it doesn't work in this case.


This is the way it's displayed:
FORUM > Linked PNG (actually PHP file) using IMG tag > PHP file shows the image while adding information in the database