It should work, If you add
php_value max_input_vars 6000
php_value suhosin.post.max_vars 6000
php_value suhosin.request.max_vars 6000
to your .htaccess
.
be sure, the webserver can read the .htaccess file you created and there are no other typos in that file.
If you get a blank page, check the errorlog of apache for errors:
tail -f /var/log/apache2/error.log &
and if you have the rights: check the syslog too for errors when you restart apache:
tail -f /var/log/syslog &
sudo apache2ctl restart
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