Don't know for magento.
But, if you want add to php.ini, add 'always_populate_raw_post_data = -1' under '[PHP]' to '/usr/local/lxlabs/kloxo/file/phpini/tpl/php.ini.tpl' and '/opt/configs/phpini/tpl/php.ini.tpl'. And then run 'sh /script/fixphp; sh /script/restart-web'.