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It is very convenient that Drupal offers so many nice-looking themes. Having a functional site that looks nice without needing to do any work is a great luxury, especially if your site s appearance isn t your main focus. However, most people will want their sites to have a unique look to them something that sets the site apart from others and contributes to the site s identity. Learning to customize existing themes or make new ones will greatly add to the quality of your Drupal experience. The most common way to theme a Drupal site is to start with an existing theme and add your own elements. By testing several existing themes and choosing the one that brings you closest to your goals, you often save hours of work. You won t need to worry about the basics, such as deciding how many columns to use, whether the design should be fixed width or flexible, the size of the header, and so on. By modifying an existing theme, you can work incrementally, changing one element at a time, slowly morphing it into an original creation. Many of the trickier problems will have already been solved by the theme s original author. On the other hand, a finished theme is often an intricate web of templates and style sheet information. If you find yourself spending a lot of time stripping away other people s ideas and longing for a clean slate, starting from scratch is not difficult and gives you the greatest control over your theme. Whether you decide to modify an existing theme or make your own, a good understanding of how themable functions and templates work will be necessary, especially if you intend to modify the HTML that is being output.

The <% %> contains code that will be executed by the server. In this case, it is a value calculated on the fly as part of the session. When it s evaluated, the result is injected into the HTML and returned to the browser. This is the underpinning of technologies such as classic ASP, which runs on Internet Information Server (IIS) and uses a Microsoft Visual Basic like language between the tags. A similar architecture is used by Personal Hypertext Processor (PHP), which runs on its own interpreter that can be an IIS or other web server extension, and uses its own C++-like language. There are many other examples as well, such as Java Server Pages (JSP), which uses an approach where the HTML is not written out using code, but instead contains tags that are interpreted and replaced at runtime with calculated values; or Ruby, an object-oriented scripting language that works well for generating web content. The opportunity was there for a best-of-both-worlds approach. And here is where ASP .NET arrived to fill the gap.

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The HTML output that is generated by Drupal has been carefully crafted to be accessible, lightweight, and easily styled with CSS. Despite this, you may find yourself wanting to change the HTML output in some way. Drupal takes great care to make this possible without forcing you to change the source code of the core files and modules. Instead, all HTML that is output comes from themable functions that can be overwritten from within individual themes. The role of the theme is to provide alternate versions of themable functions for the cases where different output is desired. Keeping these changes at the theme level, rather than needing to hack core files and modules, is a great advantage when it comes to upgrading Drupal to a new version, as it saves you from hunting down all the changes in the old version and reimplementing them in the new version. It is also necessary if you intend to host multiple sites from one codebase, a topic covered in 6. You can identify themable functions in the core includes and modules by their name, which starts with theme_. This naming convention allows Drupal to identify the function s role

ASP .NET was the result of developers and architects sitting back and thinking about the direction in which web development had taken to date. In some ways, developers had been painted into a corner by rapid innovation and were now in a nonoptimal development environment. ASP .NET was designed to get around a number of issues regarding how to develop web applications at the time. At the same time, it began spurring innovation of new types of applications that previously might not have been possible. First, it was designed to be a code-friendly environment using sophisticated objectoriented methodology that allowed for rapid code development and reuse, as opposed to the scripting-like environment used previously. Second, it was designed to be a multiple-language single runtime, allowing developers from different backgrounds to use it with minimal retraining. For the Visual Basic folk, Visual Basic .NET was available, and for those used to more traditional object-oriented languages such as C++ or Java, a new language C# was introduced.

and purpose, and also to override it by redirecting calls to an overriding function if one is available in the theme. Table 5-2 lists some themable functions and what they do. It is far from complete but it will give you an idea of how themable functions are used in Drupal. Notice that all of the functions listed start with theme_. Table 5-2. Some Themable Functions

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