designpromote

The both are the same in my view. However, if myfunction() is called quite often, the second one provides a better performance. As stated for add_filter() (http://codex.wordpress.org/Function_Reference/add_filter), there is no test that the function exists nor whether the $function_to_add is even a string. It is up to you to take care and this is done for optimization purposes, so everything is as quick as possible. .

Suppose you are using 2012 template. I use the code below:

register_sidebar( array(
'name' => __( 'Third Front Page Widget Area', 'restaurant' ),
'id' => 'sidebar-4',
'description' => __( 'Appears when using the optional Front Page template with a page set as Static Front Page', 'restaurant' ),
'before_widget' => '<aside id="%1$s" class="widget %2$s">',
'after_widget' => '</aside>',
'before_title' => '<h3 class="widget-title">',
'after_title' => '</h3>',
) );

If your questions are about CSS, please use firebug in Firefox. For example (#myid #mywidget #mytext) have more weight than (#mywidget #mytext) or (#myid #mytext), CSS structure are different between 2012 and 2011.