wp-content/themes/twentyten/functions.php:540Registers widgetized areas, including two sidebars and four widget-ready columns in the footer.
function twentyten_widgets_init() { // Area 1, located at the top of the sidebar. register_sidebar( array( 'name' => __( 'Primary Widget Area', 'twentyten' ), 'id' => 'primary-widget-area', 'description' => __( 'Add widgets here to appear in your sidebar.', 'twentyten' ), 'before_widget' => '<li id="%1$s" class="widget-container %2$s">', 'after_widget' => '</li>', 'before_title' => '<h3 class="widget-title">', 'after_title' => '</h3>', ) ); // Area 2, located below the Primary Widget Area in the sidebar. Empty by default. register_sidebar( array( 'name' => __( 'Secondary Widget Area', 'twentyten' ), 'id' => 'secondary-widget-area', 'description' => __( 'An optional secondary widget area, displays below the primary widget area in your sidebar.', 'twentyten' ), 'before_widget' => '<li id="%1$s" class="widget-container %2$s">', 'after_widget' => '</li>', 'before_title' => '<h3 class="widget-title">', 'after_title' => '</h3>', ) ); // Area 3, located in the footer. Empty by default. register_sidebar( array( 'name' => __( 'First Footer Widget Area', 'twentyten' ), 'id' => 'first-footer-widget-area', 'description' => __( 'An optional widget area for your site footer.', 'twentyten' ), 'before_widget' => '<li id="%1$s" class="widget-container %2$s">', 'after_widget' => '</li>', 'before_title' => '<h3 class="widget-title">', 'after_title' => '</h3>', ) ); // Area 4, located in the footer. Empty by default. register_sidebar( array( 'name' => __( 'Second Footer Widget Area', 'twentyten' ), 'id' => 'second-footer-widget-area', 'description' => __( 'An optional widget area for your site footer.', 'twentyten' ), 'before_widget' => '<li id="%1$s" class="widget-container %2$s">', 'after_widget' => '</li>', 'before_title' => '<h3 class="widget-title">', 'after_title' => '</h3>', ) ); // Area 5, located in the footer. Empty by default. register_sidebar( array( 'name' => __( 'Third Footer Widget Area', 'twentyten' ), 'id' => 'third-footer-widget-area', 'description' => __( 'An optional widget area for your site footer.', 'twentyten' ), 'before_widget' => '<li id="%1$s" class="widget-container %2$s">', 'after_widget' => '</li>', 'before_title' => '<h3 class="widget-title">', 'after_title' => '</h3>', ) ); // Area 6, located in the footer. Empty by default. register_sidebar( array( 'name' => __( 'Fourth Footer Widget Area', 'twentyten' ), 'id' => 'fourth-footer-widget-area', 'description' => __( 'An optional widget area for your site footer.', 'twentyten' ), 'before_widget' => '<li id="%1$s" class="widget-container %2$s">', 'after_widget' => '</li>', 'before_title' => '<h3 class="widget-title">', 'after_title' => '</h3>', ) );}Introduced in Twenty Ten 1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-content/themes/twentyten/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.