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CHAPTER 16 CHANGING THE LOOK OF YOUR BLOG
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Installing Themes
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Once you have chosen a theme, you need to install it. Here are the steps: 1. Find the download site and download the zip file. 2. Unzip the theme zip file to your local machine. 3. Upload the files to your server, placing them in the wp-contents/themes folder. 4. Go to the Presentation administration page of your blog and activate the theme (see Figure 16-3, shown earlier in this chapter). If a theme requires a particular plug-in that you don t have installed and the theme author hasn t coded it well, you may get an error message (see Figure 16-18 later in this chapter). If this happens, activate another theme that you know does work and check the readme.txt file or the theme s documentation page (there should be a link to it on the Presentation admin page). The readme file may mention any requirements for the theme or any restrictions on usage. If you still want to use the theme, download and install any required plug-ins before activating the theme again. (Refer to 15 for instructions on installing plug-ins.)
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Modifying an Existing Theme
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If you cannot find a theme that matches your requirements, you could create your own, but that s not a trivial task. Rather than create a new theme from scratch, it is often quicker to take an existing theme similar to what you want and modify it, assuming the license allows that. This is the approach I describe here. First, let s look at the components of a theme.
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Examining a Theme s Components
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A theme consists of two or more files. At the very least, it requires a CSS style sheet named style.css and a PHP template named index.php. The style sheet must contain a specially formatted comment at the beginning of the file. This comment identifies meta-information about the theme, such as a name and description for the theme, version number, URL for the theme, and so on. Figure 16-6 shows this comment for the WordPress Default theme. The PHP file contains the HTML and WordPress tags to display your content. This file contains what WordPress calls The Loop, which is a fairly short but important piece of PHP code that is the heart of your blog page. This code displays the title and contents of your blog posts, as well as information related to it. It also displays a count of the comments a post has and a link to the comments themselves. All the rest of the information displayed on a typical blog page the blog title, links in a sidebar, archive links, and so on is peripheral to The Loop. Most of this other information is displayed by calls to template tags.
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CHAPTER 16 CHANGING THE LOOK OF YOUR BLOG
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Figure 16-6. Stylesheet meta-information
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Template tags are small pieces of PHP code (typically one line of code) placed in your template. These tags do a variety of work. Here are just a few examples of what template tags can do: List the categories in your blog. This list includes links to make your blog display all the posts in each particular category. List your archives by month, by week, or individually. Create a calendar on your page, complete with links to stories for each day and links to move the visitor backwards and forwards through the history of your blog postings. Change the title of your web page based on the current story or current category. All these template tags produce XHTML, not colors, borders, or columns. In other words, the tags make the real content of your blog, marked up semantically, with meaning. The CSS applies the look to this page, adding the colors, positioning different elements into columns, and so on. This allows you to deliver the content in a number of ways without changing the content itself.
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As an example of the variety of ways you can deliver the same content in very, very different ways, Tip
pay a visit to the CSS Zen Garden (http://csszengarden.com). This is a site put together to demonstrate the design capabilities of CSS. The site has hundreds of different themes in a vast range of styles from simple, business-like designs, to eastern-flavored works of art, through punk-styled graffiti-like pieces. But every single version of the site uses exactly the same HTML content!
WordPress goes further than many theming and skinning systems. It can automatically use special template files in appropriate circumstances if it finds them. For example, if you are
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