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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 4 times in this file.
Line | Code |
---|---|
506 | if ( $new_blog == $blog_id ) { |
507 | /** |
508 | * Fires when the blog is switched. |
509 | * |
510 | * @since MU (3.0.0) |
511 | * |
512 | * @param int $new_blog New blog ID. |
513 | * @param int $new_blog Blog ID. |
514 | */ |
515 | do_action( 'switch_blog', $new_blog, $new_blog ); |
516 | $GLOBALS['switched'] = true; |
517 | return true; |
518 | } |
519 |
|
520 | $wpdb->set_blog_id( $new_blog ); |
521 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
522 | $prev_blog_id = $blog_id; |
523 | $GLOBALS['blog_id'] = $new_blog; |
524 |
|
Line | Code |
539 | wp_cache_add_global_groups( $global_groups ); |
540 | } else { |
541 | wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'useremail', 'userslugs', 'site-transient', 'site-options', 'blog-lookup', 'blog-details', 'rss', 'global-posts', 'blog-id-cache', 'networks', 'sites', 'site-details', 'blog_meta' ) ); |
542 | } |
543 | wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) ); |
544 | } |
545 | } |
546 |
|
547 | /** This filter is documented in wp-includes/ms-blogs.php */ |
548 | do_action( 'switch_blog', $new_blog, $prev_blog_id ); |
549 | $GLOBALS['switched'] = true; |
550 |
|
551 | return true; |
552 | } |
553 |
|
554 | /** |
555 | * Restore the current blog, after calling switch_to_blog() |
556 | * |
557 | * @see switch_to_blog() |
Line | Code |
572 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) { |
573 | return false; |
574 | } |
575 |
|
576 | $blog = array_pop( $GLOBALS['_wp_switched_stack'] ); |
577 | $blog_id = get_current_blog_id(); |
578 |
|
579 | if ( $blog_id == $blog ) { |
580 | /** This filter is documented in wp-includes/ms-blogs.php */ |
581 | do_action( 'switch_blog', $blog, $blog ); |
582 | // If we still have items in the switched stack, consider ourselves still 'switched' |
583 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
584 | return true; |
585 | } |
586 |
|
587 | $wpdb->set_blog_id( $blog ); |
588 | $prev_blog_id = $blog_id; |
589 | $GLOBALS['blog_id'] = $blog; |
590 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
Line | Code |
607 | wp_cache_add_global_groups( $global_groups ); |
608 | } else { |
609 | wp_cache_add_global_groups( array( 'users', 'userlogins', 'usermeta', 'user_meta', 'useremail', 'userslugs', 'site-transient', 'site-options', 'blog-lookup', 'blog-details', 'rss', 'global-posts', 'blog-id-cache', 'networks', 'sites', 'site-details', 'blog_meta' ) ); |
610 | } |
611 | wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) ); |
612 | } |
613 | } |
614 |
|
615 | /** This filter is documented in wp-includes/ms-blogs.php */ |
616 | do_action( 'switch_blog', $blog, $prev_blog_id ); |
617 |
|
618 | // If we still have items in the switched stack, consider ourselves still 'switched' |
619 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
620 |
|
621 | return true; |
622 | } |
623 |
|
624 | /** |
625 | * Switches the initialized roles and current user capabilities to another site. |