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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.
| Line | Code |
|---|---|
| 1644 | } |
| 1645 | |
| 1646 | /** |
| 1647 | * Correct 404 redirects when NOBLOGREDIRECT is defined. |
| 1648 | * |
| 1649 | * @since MU |
| 1650 | */ |
| 1651 | function maybe_redirect_404() { |
| 1652 | global $current_site; |
| 1653 | if ( is_main_site() && is_404() && defined( 'NOBLOGREDIRECT' ) && ( $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ) ) ) { |
| 1654 | if ( $destination == '%siteurl%' ) |
| 1655 | $destination = network_home_url(); |
| 1656 | wp_redirect( $destination ); |
| 1657 | exit(); |
| 1658 | } |
| 1659 | } |
| 1660 | |
| 1661 | /** |
| 1662 | * Add a new user to a blog by visiting /newbloguser/username/. |