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foreach my $name (sort keys %{*::}) { next if $name eq 'main'; print "Symbol '$name' => \n"; # extract the glob reference my $globref = ${*::} {$name}; # define local package variables through alias local *entry = *{$globref}; # make sure we can access them in 'strict' mode our ($entry, @entry, %entry); # extract scalar, array, and hash via alias print "\tScalar: $entry \n" if defined $entry; print "\tArray : [@entry] \n" if @entry; print "\tHash : {", join(" ", {%entry}), "} \n" if %entry; # check for subroutine and handle via glob print "\tSub '$name' defined \n" if *entry{CODE}; print "\tHandle '$name' (", fileno(*entry), ") defined \n" if *entry{IO}; } The Dumpvalue module provides a more convenient interface to the symbol table and forms a core part of the Perl debugger. It does essentially the same thing as the preceding example, but more thoroughly and with a more elegant output. The following script builds a hierarchy of symbol tables and variables and then uses the Dumpvalue module to print them out: #!/usr/bin/perl # dumpval.pl use warnings; use strict; use Dumpvalue; # first define some variables { # no warnings to suppress 'usage' messages no warnings; package World::Climate; our $weather = "Variable"; package World::Country::Climate; our %weather = ( England => 'Cloudy' ); package World::Country::Currency; our %currency = ( England => 'Sterling', France => 'Franc', Germany => 'Mark', USA => 'US Dollar', );

package World::Country::City; our @cities = ('London', 'Paris', 'Bremen', 'Phoenix'); package World::Country::City::Climate; our %cities = ( London => 'Foggy and Cold', Paris => 'Warm and Breezy', Bremen => 'Intermittent Showers', Phoenix => 'Horrifyingly Sunny', ); package World::Country::City::Sights; our %sights = ( London => ('Tower of London','British Museum'), Paris => ('Eiffel Tower','The Louvre'), Bremen => ('Town Hall','Becks Brewery'), Phoenix => ('Arcosanti'), ); } my $dumper = new Dumpvalue (globPrint => 1); $dumper->dumpValue(\*World::); While Dumpvalue can be pressed into service this way, it is worth considering the Symbol::Table module, available from CPAN, which provides a more focused interface.

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Once development is finished on a certain branch, it is time to merge the branch with the main development tree using the Merge command. Essentially, Merge takes all the changes that you have made in the branch and applies them to the trunk. When merging, you would specify the trunk as the source of the merge and the selected branch as the destination. At this point you can also specify which revision of the branch to merge with which revision of the trunk. SVN clients, such as TortoiseSVN, allow you to see a difference between the two development paths and do a simulated run of the merge called a dry run. A dry run is recommended to make sure that your Merge settings are correct. Once you are satisfied that the correct action will be taken, perform the merge. Remember that after every merge, you need to Commit to the repository for the changes to take effect.

Summary

Scope and visibility are important concepts in any programming language. Perl has two distinct kinds of scope, package scope and lexical scope, each of which has its own rules and reasons for being. A discussion of scope therefore becomes a discussion of package variables, and declarations, versus lexical variables. We began with a discussion of package variables and their scoping rules, including defining them under strict, the distinction between package and global variables, declaring package variables lexically with our, overriding them temporarily with local, and why we probably meant to use my instead. We then talked about lexical variables, declaring them with my, and how they differ from package variables and variables declared with our. We finished off with a look at the symbol table, which is the underlying structure in which not just package variables but subroutine declarations and file handles live. As it turns out, the symbol table is really just a big nested collection of typeglobs, so we also saw how to create new entries in the symbol table, how to create aliases for existing package variables and subroutines, and finally how to walk through the symbol table and examine its contents programmatically.

Once again, these options should not be the primary focus when optimizing your PHP code. Focusing on our PHP performance roadmap, PHP best practices are the initial module within our PHP layer, as shown in Figure 3 1.

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