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sub mod_perl_wrapper {
   ##### Begining of script #####
...

mod_perl_wrapper(4);  # First request prints "4"
mod_perl_wrapper(5);  # Subsequent requests also prints "4"

sub mod_perl_wrapper {
   ##### Begining of script #####
...

mod_perl_wrapper(4);  # 1st request prints "4"
mod_perl_wrapper(5);  # 2nd request prints "5"