how can i modify the array ?

12monkey has asked for the wisdom of the Perl Monks concerning the following question:

i made a guestbook and i want to add some function. eg:del post and modify post i can do the del function , but don't know how to do the modify, below is my admin.pl

#!/usr/bin/perl

print "content-type:text/html\n\n";

$admin ="sonic";

if($ENV{'REQUEST_METHOD'} eq "POST"){
read(STDIN,$buffer,$ENV{'CONTENT_LENGTH'});
}else{
$buffer=$ENV{'QUERY_STRING'};
}

@pairs=split(/&/,$buffer);
foreach $pair(@pairs){
($name,$value)=split(/=/,$pair);
$value=~tr/+/ /;
$value=~s/%([0-9a-fA-F][0-9a-fA-F])/pack("C",hex($1))/eg;
$value=~s/</&lt;/g;
$value=~s/\n/<br>/g;
$FORM{$name}=$value;
}

open(READ,"guestbook.dat");
@lines=<READ>;
close(READ);

my $pw = $FORM{'password'};
my $adminmsg = $FORM{'ownermsg'};
my $modnum = $FORM{'postid'};

if ( $admin eq $pw ) {

foreach $line(@lines) {
( $number,$sign_name,$sign_email,$sign_homepage,$sign_icon,$sign_time,
+$sign_msg ) = split ( /__/, $line ) ;
if ( $modnum ne $number ) 
    {
push ( @data , $line );
open(WRITE,">guestbook.dat");
print WRITE @data;
close(WRITE);
    }
}
print "Loading ...";
print "<META HTTP-EQUIV=Refresh CONTENT=2;URL=viewguestbook.pl?action=
+view_post&start=0&end=$show>";
}else{
print <<EOF;
<center>wrong password<br>
Please <a href=javascript:window.history.back()>go back</a> !
</center>
EOF
}
[download]

if i want modify a post message($sign_message)only,
then write back into guestbook.dat ,
how to write back to the orginal place ,
is it use sort and resever ?
hope someone can understand my question!!

Comment on how can i modify the array ? Download Code

Replies are listed 'Best First'.
(dooberwah) Re: how can i modify the array ? by dooberwah (Pilgrim) on Jun 05, 2002 at 13:37 UTC
Greetings First of all, You really should use CGI.pm, strict, and warnings. With that said: you can easily modify `$sign_msg` and then join all the variables back one string. `($number, $sign_name, $sign_email, $sign_homepage, $sign_icon, $sign_t +ime, $sign_msg ) = split ( /__/, $line ) ; $sign_msg = "Hello, World!\n"; # Do your modification here $newline = join ( /__/, ($number, $sign_name, $sign_email, $sign_homep +age, $sign_icon, $sign_time, $sign_msg ); push @newarray, $newline;` [download] -Ben Jacobs (dooberwah) http://dooberwah.perlmonk.org "one thing i can tell you is you got to be free"	[reply] [d/l] [select]
Re: (dooberwah) Re: how can i modify the array ? by Anonymous Monk on Jun 05, 2002 at 20:12 UTC
thx for reply use `join` can modify the sign_msg but how to write it back in the middle of the array? 4__taka__email__url__icon__time__message 3__12monkey__email__url__icon__time__message 2__sarah__email__url__icon__time__message 1__john__email__url__icon__time__message (after i modify third message , how to write into the orginal place ?)	[reply] [d/l]
Re: (dooberwah) Re: how can i modify the array ? by 12monkey (Initiate) on Jun 05, 2002 at 20:21 UTC
if ( $admin eq $pw ) { foreach $line(@lines) { ( $num,$sign_name,$sign_email,$sign_homepage,$sign_icon,$sign_time,$si +gn_msg ) = split ( /__/, $line ) ; if ( $modnum < $num ) { push @largedata , $line ; } elsif ( $modnum eq $num ) { $sign_msg="$adminmsg"; $new = join ('__',( $modnum , $sign_name , $sign_email , $sign_hom +epage , $sign_icon , $sign_time , $sign_msg)); push @modifydata , $new; } elsif ( $modnum > $num) { push @lessdata , $line ; } } open(WRITE,">guestbook.dat"); print WRITE @largedata; print WRITE @modifydata; print WRITE "\n"; print WRITE @lessdata; close(WRITE); [download] yeah , i have done it anything need to improve?	[reply] [d/l]