Sending an attachment + XML in PHP

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All,

I'm working on a project that requires the ability to send an attachment
part along with the rest of the XML associated with a soap call.
As i understand the current SoapClient implementation (as of 5.4), there is
no support for sending attachments as mime add-ons at the end of the call
nor MTOM support.

Is anyone aware of how to append a file to the end of a CURL call that also
includes both the XML as well as a binary MIME attachment?

Any help/examples would be much appreciated!

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