<?php
// Sidebar
	function wpb_init_widgets($id){
		register_sidebar(array(
		'name' => 'Sidebar',
		'id' => 'sidebar',
		'before_widget' => '<div class="well">',
		'after_widget' => '</div>',
		'before_title' => '<h4>',
		'after_title' => '</h4>',
		));
		}

add_action('widgets_init', 'wpb_init_widgets');
?>
<?php
// Call it by using
if(is_active_sidebar('sidebar')) :
dynamic_sidebar('sidebar');
endif;
?>