php - Get image extension

Question

I want get uploaded image extension.

As I know, best way is getimagesize() function.

but this function's mime, returns image/jpeg when image has .jpg or also .JPEG extension.

How can get exactly extension?

Answer 1

you can use image_type_to_extension function with image type returned by getimagesize:

$info = getimagesize($path);
$extension = image_type_to_extension($info[2]);