[Sussex] Manipulating ODT files

[Brendan Whelan]

I am trying to change the content of OpenOffice ODT files using PHP programs. 
gunzip my_file.odt   gives a directory name my_files.odt_FILES containing various directories and files, including content.xml.
I can change items within content.xml.
My attempts at rezipping the files back to an odt don't give the correct structure.
How do I rezip the directories and files to give a valid odt file?

Thanks,  Brendan  
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