Re^4: Print HTML form to file using CGI.pm save method

[SerZKO]

But isn't it so that when you return a variable from a subroutine you return it to main scope only ? I've tried to call it from another subroutine and got error message (global symbol $Extnr needs explicit package name). So it seems that I either need to declare those in main scope or to use an intermediate variable to transfer the value of $Extnr through different scopes. Or... ?

[Anonymous Monk]

But isn't it so that when you return a variable from a subroutine you return it to main scope only ?

No, you return it to the caller

Consider

 sub sparaData {
open (KOF, ">$konfil") or die "Kan inte \xF6ppna filen $konfil";
flock (KOF, 2) or die "Kan inte l\xE5sa filen $konfil";
$qry-> save (*KOF) or die "Kan inte spara filen $konfil"; 
close KOF;
$size = -s $konfil;
return;
}

Its better written as

sub sparaData {
    my( $konfil, $qry ) = @_;

    open my($KOF), ">$konfil"  or die "Kan inte \xF6ppna filen $konfil
+";
flock $KOF, 2  or die "Kan inte l\xE5sa filen $konfil";
$qry-> save ( $KOF) or die "Kan inte spara filen $konfil"; 
    close $KOF;
    my $size = -s $konfil;
    return $size;
}

And use it as

my $qry = CGI->new;
my $number = sparaData( "blah/blah/blah.data", $qry );

$qry and $qry are not the same variable, $size and $number are not the same variable -- they each respectively have the same value, but they live in different scopes

If you changed it to

my $roshambo = CGI->new;
my $size = sparaData( "blah/blah/blah.data", $roshambo );

the new code would still work because you don't depend on global vars

See Tutorials: Variable Scoping in Perl: the basics, Coping with Scoping , Mini-Tutorial: Perl's Memory Management, Lexical scoping like a fox

[Anonymous Monk]

sub kundNytt {
  my ($trans) = @_;
  # do something with $trans

  my $somevar = 88;
  return $somevar;
}


my $result;
$result = kundNytt(42);

print $result;  # prints '88'