February 12, 2011 
Definition:
function register_sidebar($args = array() {}
Builds the definition for a single sidebar and returns the ID.
The $args parameter takes either a string or an array with ‘name’ and ‘id’ contained in either usage. It will be noted that the values will be applied to all sidebars, so if creating more than one, it will be advised to allow for WordPress to create the defaults for you.
Parameters
- string|array $args: Builds Sidebar based off of ‘name’ and ‘id’ values
Return values
returns:The sidebar id that was added.
Defined actions
- register_sidebar
do_action( 'register_sidebar', $sidebar );
Source code
function register_sidebar($args = array()) {
global $wp_registered_sidebars;
$i = count($wp_registered_sidebars) + 1;
$defaults = array(
'name' => sprintf(__('Sidebar %d'), $i ),
'id' => "sidebar-$i",
'description' => '',
'class' => '',
'before_widget' => '<li id="%1$s" class="widget %2$s">',
'after_widget' => "</li>\n",
'before_title' => '<h2 class="widgettitle">',
'after_title' => "</h2>\n",
);
$sidebar = wp_parse_args( $args, $defaults );
$wp_registered_sidebars[$sidebar['id']] = $sidebar;
add_theme_support('widgets');
do_action( 'register_sidebar', $sidebar );
return $sidebar['id'];
}
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A HitchHackers guide through WordPress 
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