Yikes, don't try and implement CGI.pm yourself. See here for more info.

Your loop is a little "dodgy", using array slices and such. Also, the chomp() is chomping $_, which means nothing in the context you gave it, since $_ is being set to the array index.

If you end up not using CGI.pm (ack), rewrite the loop so that chomp actually does something.

# iterate over the split
# placing each element in $_ along the way
my @InfoArray;
for (split(/&/, $post_info))   {
    chomp; # remove newline
    ($dummy, $temp) = split (/=/, $_);
    $temp =~ tr/+/ /;
    # ack, urldecoding in a regex ?
    $temp =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
    push(@InfoArray,$temp);
}
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But do please try Cgi.pm...it's well equipped to pull out the form values, do the (un)encoding of urls, etc.