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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 |
|---|---|
| 504 | if ( empty( $new_blog ) ) |
| 505 | $new_blog = $GLOBALS['blog_id']; |
| 506 | |
| 507 | $GLOBALS['_wp_switched_stack'][] = $GLOBALS['blog_id']; |
| 508 | |
| 509 | /* If we're switching to the same blog id that we're on, |
| 510 | * set the right vars, do the associated actions, but skip |
| 511 | * the extra unnecessary work */ |
| 512 | if ( $new_blog == $GLOBALS['blog_id'] ) { |
| 513 | do_action( 'switch_blog', $new_blog, $new_blog ); |
| 514 | $GLOBALS['switched'] = true; |
| 515 | return true; |
| 516 | } |
| 517 | |
| 518 | $wpdb->set_blog_id( $new_blog ); |
| 519 | $GLOBALS['table_prefix'] = $wpdb->prefix; |
| 520 | $prev_blog_id = $GLOBALS['blog_id']; |
| 521 | $GLOBALS['blog_id'] = $new_blog; |
| 522 | |
| Line | Code |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | if ( did_action( 'init' ) ) { |
| 545 | $wp_roles->reinit(); |
| 546 | $current_user = wp_get_current_user(); |
| 547 | $current_user->for_blog( $new_blog ); |
| 548 | } |
| 549 | |
| 550 | do_action( 'switch_blog', $new_blog, $prev_blog_id ); |
| 551 | $GLOBALS['switched'] = true; |
| 552 | |
| 553 | return true; |
| 554 | } |
| 555 | |
| 556 | /** |
| 557 | * Restore the current blog, after calling switch_to_blog() |
| 558 | * |
| 559 | * @see switch_to_blog() |
| Line | Code |
| 564 | function restore_current_blog() { |
| 565 | global $wpdb, $wp_roles; |
| 566 | |
| 567 | if ( empty( $GLOBALS['_wp_switched_stack'] ) ) |
| 568 | return false; |
| 569 | |
| 570 | $blog = array_pop( $GLOBALS['_wp_switched_stack'] ); |
| 571 | |
| 572 | if ( $GLOBALS['blog_id'] == $blog ) { |
| 573 | do_action( 'switch_blog', $blog, $blog ); |
| 574 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 575 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 576 | return true; |
| 577 | } |
| 578 | |
| 579 | $wpdb->set_blog_id( $blog ); |
| 580 | $prev_blog_id = $GLOBALS['blog_id']; |
| 581 | $GLOBALS['blog_id'] = $blog; |
| 582 | $GLOBALS['table_prefix'] = $wpdb->prefix; |
| Line | Code |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | if ( did_action( 'init' ) ) { |
| 606 | $wp_roles->reinit(); |
| 607 | $current_user = wp_get_current_user(); |
| 608 | $current_user->for_blog( $blog ); |
| 609 | } |
| 610 | |
| 611 | do_action( 'switch_blog', $blog, $prev_blog_id ); |
| 612 | |
| 613 | // If we still have items in the switched stack, consider ourselves still 'switched' |
| 614 | $GLOBALS['switched'] = ! empty( $GLOBALS['_wp_switched_stack'] ); |
| 615 | |
| 616 | return true; |
| 617 | } |
| 618 | |
| 619 | /** |
| 620 | * Determines if switch_to_blog() is in effect |