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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.

In all of the cases below, index.php serves as the fallback. If a more specific template is not present, index.php will be used. See codex.wordpress.org/Template_Hierarchy for more information about the theme file hierarchy. Sometimes it s hard to tell which file is being used to display a particular page. If you ve made changes to a template, but they don t seem to be taking effect, most likely WordPress is not using the template you thought it was. You can use the Show Template plugin to find out. The plugin prints a comment in the footer identifying the theme file that was used to generate the page, as shown in Listing 6-17.

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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

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

theme_block theme_box theme_breadcrumb theme_comment theme_form_element theme_links theme_book_navigation theme_page theme_node theme_profile_listing theme_submenu theme_user_profile

Listing 6-17. The Show Template plugin in action <div id="footer" role="contentinfo"> <p> Testing is proudly powered by <a href="http://wordpress.org/">WordPress</a> <br /><a href="http://wordpress/feed/">Entries (RSS)</a> and <a href="http://wordpress/comments/feed/">Comments (RSS)</a>. <!-- 14 queries. 0.169 seconds. --> </p> </div> </div> <!-- Active Template: /Users/steph/Sites/wordpress/wp-content/themes/default/single.php --> </body> </html>

includes/theme.inc includes/theme.inc includes/theme.inc modules/comment.module includes/theme.inc includes/theme.inc modules/book.module includes/theme.inc includes/theme.inc modules/profile.module includes/theme.inc modules/user.module

Handles blocks Builds a container Generates a breadcrumb trail Handles comments Styles elements that are typically found in forms, such as text boxes and input tags Takes a list of links such as primary and secondary links and styles them Is responsible for the previous, up, and next links in book hierarchies Generates Drupal pages Handles nodes Takes one user and displays her profile fields (for use in lists of users) Generates a submenu Generates the listing of a user s account information; the one seen by visiting user/1, for example Generates an XML icon

If you have chosen to show your most recent posts on your home page, home.php will be used (if it exists) instead of index.php. It s also possible to use index.php as a unique home page template if your theme contains all the other possible archive templates, so that index.php is never used for any other page display. If you have chosen a specific page as your site s home page, the appropriate page template will be used instead, even if home.php exists.

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