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Re^5: Print HTML form to file using CGI.pm save method

by Anonymous Monk
on Aug 04, 2012 at 10:36 UTC ( #985423=note: print w/ replies, xml ) Need Help??


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

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


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