$ pm_1184309_getopt_long_opts_from_string.pl -x 1 -y 2
{ "x=i" => \0, "y=i" => \0, "z=i" => \0 }
{ "x=i" => \1, "y=i" => \2, "z=i" => \0 }
Enter new: -y 3 -z 4 -x 0
{ "x=i" => \0, "y=i" => \3, "z=i" => \4 }