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When developing Themes, it’s good to keep in mind that your Theme should be set up so that it can work well with any WordPress plugins users might decide to install. Plugins add functionality to WordPress via “Action Hooks” (see Plugin API for more information)
Most Action Hooks are within the core PHP code of WordPress, so your Theme does not have to have any special tags for them to work. But a few Action Hooks do need to be present in your Theme, in order for Plugins to display information directly in your header, footer, sidebar, or in the page body. Here is a list of the special Action Hook Template Tags you need to include:
As of WordPress 3.4, a new Theme Customization feature is available by default for nearly all WordPress themes. The Theme Customization admin page is automatically populated with options that a theme declares support for with add_theme_support() or using the Settings API, and allows admins to see non-permanent previews of changes they make in real time.
Theme and plugin developers interested in adding new options to a theme’s Theme Customization page should see the documentation on the Theme Customization API. Additional tutorials on the Theme Customization API are available at the Ottopress.com website.
You should escape dynamically generated content in your Theme, especially content that is output to HTML attributes. As noted in WordPress Coding Standards, text that goes into attributes should be run through esc_attr() so that single or double quotes do not end the attribute value and invalidate the XHTML and cause a security issue. Common places to check are title, alt, and value attributes.
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