Hi Kirill,
Thanks for the patch, again, like the import groups offline patch, i think this could be refined either into core or an admin tool. Have you considered this? i think a tracker issue might garner some help in doing this.

Please update with a bug tracker url (to any MDL or simply to github to maintain patch) when ready.

I've now approved this patch within the Other category. You will need to submit a new entry if you convert it to an actual plugin.

I coudn't install it using the plug-in instaler from moodle... is there any other way to do that?
Thanks

Marcos,
No installation is required, just apply the patch (code changes) and that's it.

Hello Kirill,

I tried to use your code to patch my moodle (v2.5). I do not know anything about the patch install so I modified the files manually and I created the exportcsv.php file. Unfortunately, I failed, because the system displayed an error message (""). Could you help me to implement the code in Moodle 2.5?

Thanks,
Andrew

Sorry, I forgot to tell: it should be a database error. Maybe the 31st row in the exportcsv.php file? (pgsql trick for getting unique row numbers in result to please Moodle)

OK, I got it, it's for PostgreSQL, and I'm using MySQL database....

Basically starting with Moodle 3.6 this function is now in Moodle core.