Description:
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imap_sort($stream, SORTARRIVAL, 1) returns an array with the same number of items as messages in the mailbox (e.g., 438 messages), but each location in the array is empty. The problem occurs with (imap-2002 or imap-2006) and (4.4.2 or 4.4.4 or 5.1.6 or 5.2R4). Reading from the Courier IMAP server with other clients works fine. This is being compiled as a module for Apache 2.2.3. The default locale on the server is en_US.UTF-8.

configure --with-apxs2=/local/apache/bin/apxs --disable-cli \
--disable-cgi --without-pear --disable-ipv6 --disable-all \
--with-imap=/local/home/mose/imap-2006 \
--with-ldap --with-mysql --with-mysql-sock --with-pcre-regex


Reproduce code:
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imap_open($stream, $user, $password, $options);
return imap_sort($stream, SORTARRIVAL, 1);


Expected result:
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The returned array should be a list of integers representing messages ordered by arrival date and time.

Actual result:
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Each location of the array is empty. It is as if the message numbers were lost, or the message number is being retrieved from the wrong place.