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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 |
|---|---|
| 512 | if ( empty( $new_blog ) ) |
| 513 | $new_blog = $GLOBALS['blog_id']; |
| 514 | |
| 515 | $GLOBALS['_wp_switched_stack'][] = $GLOBALS['blog_id']; |
| 516 | |
| 517 | /* If we're switching to the same blog id that we're on, |
| 518 | * set the right vars, do the associated actions, but skip |
| 519 | * the extra unnecessary work */ |
| 520 | if ( $new_blog == $GLOBALS['blog_id'] ) { |
| 521 | do_action( 'switch_blog', $new_blog, $new_blog ); |
| 522 | $GLOBALS['switched'] = true; |
| 523 | return true; |
| 524 | } |
| 525 | |
| 526 | $wpdb->set_blog_id( $new_blog ); |
| 527 | $GLOBALS['table_prefix'] = $wpdb->prefix; |
| 528 | $prev_blog_id = $GLOBALS['blog_id']; |
| 529 | $GLOBALS['blog_id'] = $new_blog; |
| 530 | |
| Line | Code |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | if ( did_action( 'init' ) ) { |
| 553 | $wp_roles->reinit(); |
| 554 | $current_user = wp_get_current_user(); |
| 555 | $current_user->for_blog( $new_blog ); |
| 556 | } |
| 557 | |
| 558 | do_action( 'switch_blog', $new_blog, $prev_blog_id ); |
| 559 | $GLOBALS['switched'] = true; |
| 560 | |
| 561 | return true; |
| 562 | } |
| 563 | |
| 564 | /** |
| 565 | * Restore the current blog, after calling switch_to_blog() |
| 566 | * |
| 567 | * @see switch_to_blog() |
| Line | Code |
| 572 | function restore_current_blog() { |
| 573 | global $wpdb, $wp_roles; |
| 574 | |
| 575 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) |
| 576 | return false; |
| 577 | |
| 578 | $blog = array_pop( $GLOBALS['_wp_switched_stack'] ); |
| 579 | |
| 580 | if ( $GLOBALS['blog_id'] == $blog ) { |
| 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 = $GLOBALS['blog_id']; |
| 589 | $GLOBALS['blog_id'] = $blog; |
| 590 | $GLOBALS['table_prefix'] = $wpdb->prefix; |
| Line | Code |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | if ( did_action( 'init' ) ) { |
| 614 | $wp_roles->reinit(); |
| 615 | $current_user = wp_get_current_user(); |
| 616 | $current_user->for_blog( $blog ); |
| 617 | } |
| 618 | |
| 619 | do_action( 'switch_blog', $blog, $prev_blog_id ); |
| 620 | |
| 621 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 622 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 623 | |
| 624 | return true; |
| 625 | } |
| 626 | |
| 627 | /** |
| 628 | * Determines if switch_to_blog() is in effect |