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Whenever we define a new package variable in a new package, we cause Perl to create symbol tables to hold the variable. In Perl syntax, package names are separated by double colons, ::, in much the same way that directories are separated by / or \, and domain names by a dot. For the same reason, the colons define a location in a hierarchical naming system. For example, if we declare a package with three package elements, we create three symbol tables, each containing an entry to the one below: package World::Country::City; our $variable = "value"; This creates a chain of symbol tables. The World symbol table created as an entry of main contains no actual variables. However, it does contain an entry for the Country symbol table, which therefore has the fully qualified name World::Country. In turn, Country contains an entry for a symbol table called City. City does not contain any symbol table entries, but it does contain an entry for a typeglob called *variable, which contains a scalar reference to the value value. When all put together as a whole, this gives us the package variable: $main::World::Country::City::variable; Since main is always the root of the symbol table tree, we never need to specify it explicitly. In fact, it usually only turns up as a result of creating a symbolic reference for a typeglob as we saw earlier. So we can also just say $World::Country::City::variable; This is the fully qualified name of the package variable. The fact that we can omit the package names when we are actually in the World::Country::City package is merely a convenience. There is no actual variable called $variable, unless we declare it lexically. Even if we were in the main package, the true name of the variable would be $main::variable.

As explained in the Terminology section, branches start as a copy of your main development tree (the trunk) when you need to create new features or a new version in your application, but do not want those changes to be available in the main application just yet. Branches are also helpful when you have multiple developers working on the same application. In that scenario, each developer can create her own branch, work on a module for which she is responsible, and when done, Merge the changes with the main development code base.

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All global variables are really package variables in the main package, and they in turn occupy the relevant slot in the typeglob with that name in the symbol table. Similarly, subroutines are just code references stored in typeglobs. Without qualification or a package declaration, a typeglob is automatically in the main package, so the following two assignments are the same:

< php echo "Hi "."there. "."how are "."you "; echo "Hi ","there. ","how are ","you "; //Slow //Faster slightly

*subglob = \&mysubroutine; *main::subglob = \&main::mysubroutine; Either way we can now call mysubroutine with either name (with optional main:: prefixes if we really felt like it): mysubroutine(); # original name subglob(); # aliased name We can, of course, alias to a different package too, to make a subroutine defined in one package visible in another This is actually how Perl s import mechanism works underneath the surface when we say use module and get subroutines that we can call without qualification in our own programs: # import 'subroutine' into our namespace *main::subroutine = \&My::Module::subroutine; Typeglob assignment works for any of the possible types that a typeglob can contain, including filehandles and code references.

So we can create an alias to a filehandle this way: *OUT = *STDOUT; print OUT "this goes to standard output"; This lets us do things like choose from a selection of subroutines at runtime: # choose a subroutine to call and alias it to a local name our *aliassub = $debug *mydebugsub: *mysubroutine; # call the chosen subroutine via its alias aliassub("Testing", 1, 2, 3); All this works because package typeglobs are actually entries in the symbol table itself Everything else is held in a typeglob of the same name Once we know how it all works, it is relatively easy to see how Perl does the same thing itself For example, when we define a named subroutine, we are really causing Perl to create a code reference, then assign it to a typeglob of that name in the symbol table.

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