Warning: array_flip() [function.array-flip]: Can only flip STRING and INTEGER values!

Hi
I got the same when I create a relationship from a content-with-an-entity-reference-field referencing some contents.

This isn't a bug in entitycache, it only happens if a module calls entity_load() with the wrong arguments, and will be the same with entitycache disabled. Please open bug reports with the contrib module causing the warning.

@catch, yes you are correct.. i'm seeing a lot of this happening from file_entity, for example. it's passing an $ids argument of array(0 => NULL) to EntityCacheControllerHelper::entityCacheLoad()

attached is a patch that will apply an array_filter against this and eliminates errors being kicked up.

The patch in #3 fails in the case of an $id arg being equal to 0 as in the case of anonymous user #0.

Here's a correction that filters out anything that is neither numeric or a string.

Please file a patch against file_entity module to fix the bug there. Hiding this with an array_filter() is just suppressing a valid error.

I believe this would have been fixed by #2132383: Warning: array_flip(): Can only flip STRING and INTEGER values! .. DrupalDefaultEntityController->load() (.. 176 .. entity.inc). already. If you are still getting this on the most recent release, then please re-open.