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;
}

[download]

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;
}

[download]

And use it as 

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

[download]
$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 );

[download]
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

In reply to Re^5: Print HTML form to file using CGI.pm save method by Anonymous Monk
in thread Print HTML form to file using CGI.pm save method by SerZKO

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