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The age-old question, to use require or require_once After this section, you ll know which one to use based on its performance. require and require_once are both PHP functions that allow developers to import external PHP files for use within a specific script. Depending on the complexity of the application, you could make a single or several require_once/require calls. By using require instead of require_once, you can increase the performance of your application. require is faster than require_once due to the high number of operational stat calls made when importing the PHP script. If the file you requested is located within the directory /var/shared/htdocs/myapp/models/MyModels/ClassA.php, the operating system will make a stat call within each of the directories before it reaches ClassA.php. In this example, that is a total of six stat calls. While require also issues stat calls, they are fewer in number. So, the fewer function calls there are, the faster your code becomes. We re going to use the code shown in Listing 3 3 to compare both approaches. Listing 3 3 uses four files that are required and imported using the require_once PHP function. Listing 3 3. Base that Loads Four External Class Files

This one simple additional step is the foundation of Perl s entire import mechanism. There is no more additional complexity or built-in support for handling modules or importing variables and subroutine names. It is all based around a simple function call that happens at compile time. The curious thing about this is that there is no requirement to actually export anything from an import subroutine. Object-oriented modules rarely export symbols and so often commandeer the import mechanism to configure the class data of the module instead. A statement like use strict vars is a trivial but common example of this alternative use in action.

There are three main advanced features of SVN that you can take advantage of in your workflow, each of which I'll cover: Reverting to a previous version Working with locks Exporting from SVN

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As the preceding expansion of use illustrates, the automatic calling of import presumes that the module actually creates a package of the same name. The import method is searched for in the package with the name of the module, irrespective of what loading the module actually causes to be defined.

As we just discussed, the major advantage that use has over require is the concept of importing While it is true that we can import directly by simply calling import ourselves, it is simpler and more convenient with use If we execute a use statement with only a module name as an argument, we cause the import subroutine within the module to be called with no argument This produces a default response from the module This may be to do nothing at all, or it may cause the module to import a default set of symbols (subroutines, definitions, and variables) for our use Object-oriented modules tend not to import anything, since they expect us to use them by calling methods If a module does not provide an import method, nothing happens of course.

Function-oriented modules often import symbols by default and optionally may import further symbols if we request them in an import list An import list is a list of items specified after the module name It can be specified as a comma-separated list within parentheses or as a space-separated list within a qw operator If we only need to supply one item, we can also supply it directly as a string.

Reverting refers to backtracking your changes to a previous revision already stored in Subversion. You might need to revert if the latest changes you have made have broken the application. Any good SVN client makes this fairly straightforward. In TortoiseSVN, just select the local development directory and use the Revert option. You will need to pick a previous revision number and off you go.

However, whatever the syntax, it is just a regular Perl list: # importing a list of symbols with a comma-separated list: use Module ('sub1', 'sub2', '$scalar', '@list', ':tagname'); # it is more legible to use 'qw': use Module qw(sub1 sub2 $scalar @list :tagname); # a single symbol can be specified as a simple string: use Module 'sub1'; # if strict references are not enabled, a bareword can be used: use strict refs; The items in the list are interpreted entirely at the discretion of the module For functional modules, however, they are usually symbols to be exported from the module into our own namespace Being selective about what we import allows us to constrain imports to only those that we actually need Symbols can either be subroutine names, variables, or sometimes tags, prefixed by a :, if the module in question supports them.

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