Description:
------------
Consecutive calls to imap_mail_compose drops the arrays passed in parts[]

Note the missing '; name="file1.ext"' and '; filename="file1.ext"' for the second echo in the actual result.

I've tested (and had this tested) on several Linux versions and two windows versions. Before posting I built a Linux PHP from the latest snapshot.

Reproduce code:
---------------
$Envelope = array('date' => date('r'));
$Parts = array(
        array('type' => TYPEMULTIPART, 'subtype' => 'mixed'),
        array('description' => 'file1.ext',
              'type' => TYPEAPPLICATION, 'subtype' => 'octet-binary','encoding' => ENCBINARY,
              'type.parameters' => array('name' => 'file1.ext'),
              'disposition.type' => 'attachment', 'disposition' => array('filename' => 'file1.ext'),
              'contents.data' => 'the contents of file1'),
        array('type' => TYPETEXT, 'subtype' => 'PLAIN', 'contents.data' => 'Any body will do')
);
echo imap_mail_compose($Envelope, $Parts)."\n\n\n";
echo imap_mail_compose($Envelope, $Parts);


Expected result:
----------------
Date: Wed, 08 Aug 2007 13:23:36 +1000
MIME-Version: 1.0
Content-Type: MULTIPART/mixed; BOUNDARY="8323328-1804289383-1186543416=:27980"

--8323328-1804289383-1186543416=:27980
Content-Type: APPLICATION/octet-binary; name="file1.ext"
Content-Transfer-Encoding: BASE64
Content-Description: file1.ext
Content-Disposition: attachment; filename="file1.ext"

dGhlIGNvbnRlbnRzIG9mIGZpbGUx

--8323328-1804289383-1186543416=:27980
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII

Any body will do
--8323328-1804289383-1186543416=:27980--



Date: Wed, 08 Aug 2007 13:23:36 +1000
MIME-Version: 1.0
Content-Type: MULTIPART/mixed; BOUNDARY="8323328-1804289383-1186543416=:27980"

--8323328-1804289383-1186543416=:27980
Content-Type: APPLICATION/octet-binary; name="file1.ext"
Content-Transfer-Encoding: BASE64
Content-Description: file1.ext
Content-Disposition: attachment; filename="file1.ext"

dGhlIGNvbnRlbnRzIG9mIGZpbGUx

--8323328-1804289383-1186543416=:27980
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII

Any body will do
--8323328-1804289383-1186543416=:27980--


Actual result:
--------------
Date: Wed, 08 Aug 2007 13:24:15 +1000
MIME-Version: 1.0
Content-Type: MULTIPART/mixed; BOUNDARY="8323328-1804289383-1186543455=:27987"

--8323328-1804289383-1186543455=:27987
Content-Type: APPLICATION/octet-binary; name="file1.ext"
Content-Transfer-Encoding: BASE64
Content-Description: file1.ext
Content-Disposition: attachment; filename="file1.ext"

dGhlIGNvbnRlbnRzIG9mIGZpbGUx

--8323328-1804289383-1186543455=:27987
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII

Any body will do
--8323328-1804289383-1186543455=:27987--



Date: Wed, 08 Aug 2007 13:24:15 +1000
MIME-Version: 1.0
Content-Type: MULTIPART/mixed; BOUNDARY="8323328-846930886-1186543455=:27987"

--8323328-846930886-1186543455=:27987
Content-Type: APPLICATION/octet-binary
Content-Transfer-Encoding: BASE64
Content-Description: file1.ext
Content-Disposition: attachment

dGhlIGNvbnRlbnRzIG9mIGZpbGUx

--8323328-846930886-1186543455=:27987
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII

Any body will do
--8323328-846930886-1186543455=:27987--