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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_id == $prev_blog_id ) { |
| 507 | /** |
| 508 | * Fires when the blog is switched. |
| 509 | * |
| 510 | * @since MU (3.0.0) |
| 511 | * |
| 512 | * @param int $new_blog_id New blog ID. |
| 513 | * @param int $prev_blog_id Previous blog ID. |
| 514 | */ |
| 515 | do_action( 'switch_blog', $new_blog_id, $prev_blog_id ); |
| 516 | $GLOBALS['switched'] = true; |
| 517 | return true; |
| 518 | } |
| 519 | |
| 520 | $wpdb->set_blog_id( $new_blog_id ); |
| 521 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| 522 | $GLOBALS['blog_id'] = $new_blog_id; |
| 523 | |
| 524 | if ( function_exists( 'wp_cache_switch_to_blog' ) ) { |
| Line | Code |
| 538 | wp_cache_add_global_groups( $global_groups ); |
| 539 | } else { |
| 540 | 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' ) ); |
| 541 | } |
| 542 | wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) ); |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 547 | do_action( 'switch_blog', $new_blog_id, $prev_blog_id ); |
| 548 | $GLOBALS['switched'] = true; |
| 549 | |
| 550 | return true; |
| 551 | } |
| 552 | |
| 553 | /** |
| 554 | * Restore the current blog, after calling switch_to_blog(). |
| 555 | * |
| 556 | * @see switch_to_blog() |
| Line | Code |
| 571 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) { |
| 572 | return false; |
| 573 | } |
| 574 | |
| 575 | $new_blog_id = array_pop( $GLOBALS['_wp_switched_stack'] ); |
| 576 | $prev_blog_id = get_current_blog_id(); |
| 577 | |
| 578 | if ( $new_blog_id == $prev_blog_id ) { |
| 579 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 580 | do_action( 'switch_blog', $new_blog_id, $prev_blog_id ); |
| 581 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 582 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 583 | return true; |
| 584 | } |
| 585 | |
| 586 | $wpdb->set_blog_id( $new_blog_id ); |
| 587 | $GLOBALS['blog_id'] = $new_blog_id; |
| 588 | $GLOBALS['table_prefix'] = $wpdb->get_blog_prefix(); |
| 589 | |
| Line | Code |
| 605 | wp_cache_add_global_groups( $global_groups ); |
| 606 | } else { |
| 607 | 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' ) ); |
| 608 | } |
| 609 | wp_cache_add_non_persistent_groups( array( 'counts', 'plugins' ) ); |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | /** This filter is documented in wp-includes/ms-blogs.php */ |
| 614 | do_action( 'switch_blog', $new_blog_id, $prev_blog_id ); |
| 615 | |
| 616 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 617 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 618 | |
| 619 | return true; |
| 620 | } |
| 621 | |
| 622 | /** |
| 623 | * Switches the initialized roles and current user capabilities to another site. |