[dev] proposal for imp/Filter.php unsupported keywords

[Igor Stroh]

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Hi there,

the current implementation of php's imap module does not support several
search criteria that are covered by imapv4 rfc. The problem is the
underlying uw-imap c-client library that can handle only imapv2
searches, so it's pretty difficult to patch php so it does understand
imapv4 searches. One of unsupported criterions is the 'NOT' keyword. The
c-client source is pretty hard to read (even for one of my colleagues
who's a real C-wizard), but it seems, that it's actually possible to run
imap searches that contain the NOT keyword though it's done in a very
strange way (this also applies to the 'OR' keyword)... However, it's not
all too trivial to do such a search, so I guess it still will take some
time for php developers to implement the stuff...
In the mean time, one can trick a bit around and do a 'NOT <criterion>'=20
simply by searching for <criterion> and doing something like
array_diff($found_uids, $all_uids);
This approach is bad, as it introduces a racing condition 'cos it cannot
be run atomically but since there are no other solutiony, this one might
be all right...

Any thoughts?

Greetings,
igor

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