restore_current_blog() vs switch_to_blog()

Question

After every instance of switch_to_blog() you should call restore_current_blog() to restore the current (actually, previous) blog.

But if you're looping through two or more blogs and calling switch_to_blog() on each, is there any reason not to use an additional switch_to_blog() at the end of the loop to switch to the original blog rather than calling restore_current_blog() at each pass.

E.g.

Why not:

 $original_blog_id = get_current_blog_id();
 foreach( $blog_ids as $blog_id ){
    switch_to_blog( $blog_id );
    //Do stuff
 }
 switch_to_blog( $original_blog_id );

instead of:

 foreach( $blog_ids as $blog_id ){
    switch_to_blog( $blog_id );
    //Do stuff
    restore_current_blog_id();
 }

Answer 1

If you want to run over multiple blogs there is no need to restore the previous blog each time. The only thing that grows is $GLOBALS['_wp_switched_stack'] – an array with blog IDs, nothing to worry about.

But keep in mind, restore_current_blog() will not work anymore after the second switch, because it uses the previous blog – which is not the first blog then. So store the first blog ID, and call switch_to_blog( $first_blog_id ); instead of restore_current_blog() when you are done.