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Many themes include options allowing the user to select layouts, color schemes, or other alternatives to the theme s default settings. I ll demonstrate using the Simplex Flex theme I created as a demo for this chapter. Theme options work just like plugin options, so you ll see many of the same concepts again in 9. You can also refer to codex.wordpress.org/Settings_API for more details on storing options in the WordPress database. If you want to add options to your theme, you need to add a page in the Appearance section of the navigation menu and construct the form itself. Unless otherwise noted, all of the following code examples should be placed in the theme s functions.php file.
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First, add the options screen to the admin navigation menu, as shown in Listing 7-28.
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Listing 7-28. Adding a theme options page to the admin menu function simplex_menu() { add_theme_page('Simplex Flex Options', 'Simplex Options', 'edit_theme_options', __FILE__, 'simplex_options_page'); } add_action('admin_menu', 'simplex_menu'); Actually, that s really all it takes! The simplex_menu() function will contain several other things in just a moment, but for now it holds only the add_theme_page() function. This function requires several arguments: The title of the options page, to be used in the <title> tag The title of the page as it will appear in the menu The capability users should have in order to access this page (see 10 for more on roles and capabilities); either edit_themes or manage_options would be a good choice for a theme options page. The path to the file containing the options page (in this case, it ll be this file) The name of the function containing the options form
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Once that s done, you have to add your simplex_menu() function to the admin menu. There s an action hook for that, so all you have to do is call add_action(). Note that you haven t created the simplex_options_page() function yet. That s OK; the menu option will show up without it, and will take you to a blank page. Before you fill in the form, you need to think about what options your theme will have.
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For the purposes of this chapter, Simplex Flex has four options: width (fixed or flexible), columns (two or three, and in which order), whether the site title and description will be shown in addition to the custom header image, and an option to manually enter additional CSS rules. You ll have to register your option with WordPress or it won t get saved. You should also set some default values. For now, I ll just mention which lines are essential in order to get your options saved and updated correctly in the database. Listing 7-29 shows the expanded function; it now registers your settings and creates some default values. The changes from the previous listing are in bold. You store all four theme options in a single database field by using an array. This is the best practice for saving theme and plugin options; it s bad form to use a separate database field for each of your options.
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Listing 7-29. Registering a setting and saving the default values function simplex_menu() { add_theme_page('Simplex Flex Options', 'Simplex Options', 'edit_theme_options', __FILE__, 'simplex_options_page'); register_setting('simplex_options', 'simplex_options'); // set defaults $options = array( 'width' => 'fixed', 'cols' => '3', 'sitename' => 'yes', 'css' => '', ); add_option('simplex_options', $options, '', 'yes'); } add_action('admin_menu', 'simplex_menu'); The register_setting() function shown here has two arguments. First, you have to assign your setting to a group. When you begin building the form, you call each group in turn. In this case, since you have just a few options, you use just one group, with the same name as the option itself. The second argument is the name of the option that will be stored to the database. Once you registered the setting, you need to save some default values. You create the $options array to hold the four values. Then you can use the add_options() function to store your array. The first argument is, again, the name of the option field in the database. The second argument is the array containing the options to be stored. The third argument should always be empty; it s a deprecated argument that s still present for backward compatibility. The fourth argument, the autoload value, determines whether or not these options will be cached on each page load. This should almost always be yes.
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