"[function.getimagesize]: failed to open stream" error on virtual domain.

[RobUK]

We have Apache on the local network managing several websites that are accessed using virtual domains (configured in the local machine's hosts file, eg. 192.168.1.10 points to dev.somedomain.com).

I am reworking the way that I access images on the site by specifying the http://etc address of the image instead of the local relative address. This is so that I can eventually have a separate server serving images to all websites (a lot of images are shared across multiple sites).

Here's the problem: I use getimagesize() on some images, and it worked before when using the relative path, (images/someimage.jpg) but when accessing it via the virtual domain (http://dev.somedomain.com/images/someimage.jpg) I get the error [function.getimagesize]: failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found. However, if I just display the image using the same path, it works fine and it displays. If I change the function to access an image on the internet instead, the getimagesize() function works fine. I am thinking it must be related to the virtual hosts, as that's the only thing that's unusual about this. Could it be something to do with file permissions?