Perl hash not initialising as expected -


i getting unexpected results perl hash (associative array).

i trying populate cgi post, form values might missing.

use strict; use data::dumper; use cgi;  $cgi = new cgi;  %data = (         'key1' => $cgi->param('fkey1'),         'key2' => $cgi->param('fkey2'),         'key3' => $cgi->param('fkey3'),         'key4' => $cgi->param('fkey4'),         'key5' => $cgi->param('fkey5'),         'key6' => $cgi->param('fkey6'),         'key7' => $cgi->param('fkey7'),         'key8' => $cgi->param('fkey8'),         'key9' => $cgi->param('fkey9'),         'key0' => $cgi->param('fkey0'),     );  print "content-type: text/html\n\n<pre>"; print dumper \%data;  $fkey1 = $cgi->param('fkey1'); $fkey2 = $cgi->param('fkey2'); $fkey3 = $cgi->param('fkey3'); $fkey4 = $cgi->param('fkey4'); $fkey5 = $cgi->param('fkey5'); $fkey6 = $cgi->param('fkey6'); $fkey7 = $cgi->param('fkey7'); $fkey8 = $cgi->param('fkey8'); $fkey9 = $cgi->param('fkey9'); $fkey0 = $cgi->param('fkey0');   %data2 = (         'key1' => $fkey1,         'key2' => $fkey2,         'key3' => $fkey3,         'key4' => $fkey4,         'key5' => $fkey5,         'key6' => $fkey6,         'key7' => $fkey7,         'key8' => $fkey8,         'key9' => $fkey9,         'key0' => $fkey0,     );  print "content-type: text/html\n\n<pre>"; print dumper \%data2;

%data wrong. have %data2. output of is:

$var1 = {      'key9' => 'key0',      'key5' => 'key6',      'key1' => 'key2',      'key7' => 'key8',      'key3' => 'key4'    };  $var1 = {     'key9' => undef,     'key5' => undef,     'key6' => undef,     'key8' => undef,     'key0' => undef,     'key3' => undef,     'key2' => undef,     'key1' => undef,     'key4' => undef,     'key7' => undef   };

so if $cgi->param('fkey1') undef, skips value , uses next key value. there need %data working?

this problem due way param behaves in list context vs. scalar context.

in scalar context, if parameter doesn't exist, param returns undef. in list context, returns empty list. suppose have hash initialization this:

my %data = ( foo => $cgi->param( 'foo' ),              bar => $cgi->param( 'bar' ),              baz => $cgi->param( 'baz' ) );

and suppose parameter bar not exist. since param called in list context, list passed hash initialization ends looking this:

( 'foo', 'foovalue', 'bar', 'baz', 'bazvalue' )

note there's nothing after bar key, because empty list returned there.

to fix it, can force calls param scalar context:

my %data = ( foo => scalar $cgi->param( 'foo' ),              bar => scalar $cgi->param( 'bar' ),              baz => scalar $cgi->param( 'baz' ) );

now list this:

( 'foo', 'foovalue', 'bar', undef, 'baz', 'bazvalue' )

and right world again.


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