christeredvartsen/imboclient-php — pull request #8 by rexxars (2012-02-01 20:17:41+00:00)
Title: No way to retrieve image identifier outside the client without doing server request first

Common usage scenario; you store the image identifiers in the application database.
Before adding an image, you check if it exists already (imageExists()).
You get back a 200 OK (image exists). You still need a reference to the image identifier for storing the reference in your application database.