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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 |
|---|---|
| 587 | if ( $new_blog == $GLOBALS['blog_id'] ) { |
| 588 | /** |
| 589 | * Fires when the blog is switched. |
| 590 | * |
| 591 | * @since MU |
| 592 | * |
| 593 | * @param int $new_blog New blog ID. |
| 594 | * @param int $new_blog Blog ID. |
| 595 | */ |
| 596 | do_action( 'switch_blog', $new_blog, $new_blog ); |
| 597 | $GLOBALS['switched'] = true; |
| 598 | return true; |
| 599 | } |
| 600 | |
| 601 | $wpdb->set_blog_id( $new_blog ); |
| 602 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| 603 | $prev_blog_id = $GLOBALS['blog_id']; |
| 604 | $GLOBALS['blog_id'] = $new_blog; |
| 605 | |
| Line | Code |
| 625 | } |
| 626 | |
| 627 | if ( did_action( 'init' ) ) { |
| 628 | $wp_roles->reinit(); |
| 629 | $current_user = wp_get_current_user(); |
| 630 | $current_user->for_blog( $new_blog ); |
| 631 | } |
| 632 | |
| 633 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 634 | do_action( 'switch_blog', $new_blog, $prev_blog_id ); |
| 635 | $GLOBALS['switched'] = true; |
| 636 | |
| 637 | return true; |
| 638 | } |
| 639 | |
| 640 | /** |
| 641 | * Restore the current blog, after calling switch_to_blog() |
| 642 | * |
| 643 | * @see switch_to_blog() |
| Line | Code |
| 649 | global $wpdb, $wp_roles; |
| 650 | |
| 651 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) |
| 652 | return false; |
| 653 | |
| 654 | $blog = array_pop( $GLOBALS['_wp_switched_stack'] ); |
| 655 | |
| 656 | if ( $GLOBALS['blog_id'] == $blog ) { |
| 657 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 658 | do_action( 'switch_blog', $blog, $blog ); |
| 659 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 660 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 661 | return true; |
| 662 | } |
| 663 | |
| 664 | $wpdb->set_blog_id( $blog ); |
| 665 | $prev_blog_id = $GLOBALS['blog_id']; |
| 666 | $GLOBALS['blog_id'] = $blog; |
| 667 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| Line | Code |
| 688 | } |
| 689 | |
| 690 | if ( did_action( 'init' ) ) { |
| 691 | $wp_roles->reinit(); |
| 692 | $current_user = wp_get_current_user(); |
| 693 | $current_user->for_blog( $blog ); |
| 694 | } |
| 695 | |
| 696 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 697 | do_action( 'switch_blog', $blog, $prev_blog_id ); |
| 698 | |
| 699 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 700 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 701 | |
| 702 | return true; |
| 703 | } |
| 704 | |
| 705 | /** |
| 706 | * Determines if switch_to_blog() is in effect |