It can be used anywhere in templates.
Usage
the_widget( $widget, $instance, $args );
Parameters
$widget (PHP class name)
WP_Widget_Archives -- Archives
WP_Widget_Calendar -- Calendar
WP_Widget_Categories -- Categories
WP_Widget_Links -- Links
WP_Widget_Meta -- Meta
WP_Widget_Pages -- Pages
WP_Widget_Recent_Comments -- Recent Comments
WP_Widget_Recent_Posts -- Recent Posts
WP_Widget_RSS -- RSS
WP_Widget_Search -- Search (a search from)
WP_Widget_Tag_Cloud -- Tag Cloud
WP_Widget_Text -- Text
WP_Nav_Menu_Widget
Archives widget
Display a monthly archive list.
the_widget( 'WP_Widget_Archives' );
Display drop-down list:
the_widget( 'WP_Widget_Archives', 'dropdown=1' );
Calendar widget
Displays a Calendar:
the_widget( 'WP_Widget_Calendar' );
Categories widget
Displays a list of categories:
the_widget('WP_Widget_Categories');
Display a dropdown list with number of posts:
the_widget( 'WP_Widget_Categories', 'dropdown=1&count=1' );
Links widget
Displays a list of links (blogroll) in categories:
the_widget( 'WP_Widget_Links' );
Display lists in category IDs 2 or 3:
the_widget( 'WP_Widget_Links', 'category=2,3' );
Meta widget
Display site meta. (Log in/out, admin, feed and WordPress links ):
the_widget( 'WP_Widget_Meta' );
Pages widget
Display a list of Pages:
the_widget( 'WP_Widget_Pages' );
Contents
as the heading, sort by last modified date:
the_widget('WP_Widget_Pages', 'title=Contents&sortby=post_modified',
'before_title=&after_title=');
Recent Comments widget
Display to a list of recent comments:
the_widget( 'WP_Widget_Recent_Comments' );
Recent Posts widget
Display to a list of recent posts:
the_widget( 'WP_Widget_Recent_Posts' );
RSS widget
Display a list of entries from any RSS or Atom feed:
the_widget( 'WP_Widget_RSS', $instance, $args );
Search widget
the_widget( 'WP_Widget_Search' );
Tag Cloud widget
the_widget( 'WP_Widget_Tag_Cloud' );
Text widget
the_widget( 'WP_Widget_Text' );
Custom Widget
Display custom widget in template:
class My_Custom_Widget extends WP_Widget
{
/* your code */
}
the_widget( 'My_Custom_Widget' );