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I usually do this:
my $IP = ENV('REMOTE_ADDR', '0.0.0.0'); print $IP; exit; ################### # This function returns an environment variable named in the # first argument. If the environment variable doesn't exist, # then DEFAULT is returned. However, if a third argument is # given, then that will be returned in every case. # The third argument is used for tweaking and testing purposes. # # Usage: VALUE = ENV( NAME, [DEFAULT, [OVERRIDE]] ) # sub ENV { return '' unless @_; # No arguments at all? my $NAME = shift; # Get NAME my $DEFAULT = @_ ? shift : ''; # Get DEFAULT value return shift if @_; # OVERRIDE? return $DEFAULT unless defined $NAME; # NAME undefined? return $DEFAULT unless $NAME; # NAME is blank? if (exists($ENV{$NAME})) { return Trim($ENV{$NAME}); } return $DEFAULT; } ################### # # This function removes whitespace before and after STRING # and returns a new string. # # Usage: STRING = Trim(STRING) # sub Trim { return '' unless @_; my $T = shift; return '' unless defined $T; return '' unless length($T); my $s = -1; # start ptr my $e = 0; # end ptr for (my $i = 0; $i < length($T); $i++) { if (vec($T, $i, 8) > 32) { if ($s < 0) { $s = $i; } $e = $i; } } return substr($T, $s, $e - $s + 1); }
This means, even if REMOTE_ADDR is undefined for whatever reason, I get a string in $IP which is going to be 0.0.0.0. And then I know that it's because it was undefined!

In reply to Re: $ENV{REMOTE_ADDR} problem by harangzsolt33
in thread $ENV{REMOTE_ADDR} problem by bigup401

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