Syntax of imap_search()

[Domain nikha.org]

Hi Dears!

I need a logigal distincton for two search criteria in imap_search().
The RFC 2060 says this: OR <search_key1> <search_key2>

I tried almost all possible combinations of quoted strings for OR, UNSEEN and DELETED, but all return false.

Does anybody understand the syntax?

Thanks for any help,
Niklaus