If you need to get just filename from url withour file extension then you can get that using basename() php function. In bellow example i give you how to get image name without extension. first we need to get extension of given filename url and then basename() through we can remove that extension like as i did bellow:
Example:
$imagePath = "/home/hd/html/test.jpg";
$ext = pathinfo($imagePath, PATHINFO_EXTENSION);
$file = basename($imagePath,".".$ext);
print_r($file);