Optimizing PHP for a Linode 1GB Issue

when I come to this step:/etc/php5/apache2/php.ini

maxexecutiontime = 30

memory_limit = 128M

errorreporting = ECOMPILEERROR|ERECOVERABLEERROR|EERROR|ECOREERROR

display_errors = Off

log_errors = On

error_log = /var/log/php/error.log

register_globals = Off

I can't find the :register_globals = Off

but there're

http://php.net/auto-globals-jit

autoglobalsjit = On

http://php.net/register-argc-argv

registerargcargv = Off

should I set the both ??

Thanks in advance