Provide solution to export content as tarball about wikifundi HOT 6 CLOSED

For the PHP script, this must work : https://secure.php.net/manual/en/function.passthru.php

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@florentk If you can catch the compressed stream on the output an "echo" it on the HTTP stream.

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@florentk I think we have an answer here https://stackoverflow.com/questions/4357073/lamp-how-to-create-zip-of-large-files-for-the-user-on-the-fly-without-disk-cp

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fix in 8e4d514

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@florentk I reopen the ticket as the logs should not be exported. On the top of that I think the content mime-type should be set properly and also the filename should be of the type wikifundi-fr_2018-06-22.tar.bz2

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fix in 9f8d32b

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