hi,
I am new to mod_perl.This is my first doubt,and I need some help.
I test this script under mod_perl:
#!/usr/bin/perl -w
use strict;
use warnings;
print "Content-type: text/plain\r\n\r\n";
my $counter = 0; # Explicit initialization technically redundant
for (1..5) {
increment_counter();
}
sub increment_counter{
$counter++;
print "Counter is equal to $counter !\r\n";
}
When I reload from user agent,this script can't work correctly.It seems
that the script cached the result in memory.The output is:
first run:
Counter is equal to 1 !
Counter is equal to 2 !
Counter is equal to 3 !
Counter is equal to 4 !
Counter is equal to 5 !
reload:
Counter is equal to 6 !
Counter is equal to 7 !
Counter is equal to 8 !
Counter is equal to 9 !
Counter is equal to 10 !
Just as Stas Bekman said,the resolving way is to change the var declare
from:
my $counter = 0;
to:
our $counter = 0;
I have read Stas Bekman's article,but I CAN'T understand for it.In order to
avoid persistent vars between requests,we should select using 'my' to
declare a var.While here we use a 'our' var to resolve the problem.Can
anyone tell me clearly why this happen?Thanks a lot.
Angel Flower
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