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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 |
|---|---|
| 1981 | /** |
| 1982 | * Filters the redirect URL for 404s on the main site. |
| 1983 | * |
| 1984 | * The filter is only evaluated if the NOBLOGREDIRECT constant is defined. |
| 1985 | * |
| 1986 | * @since 3.0.0 |
| 1987 | * |
| 1988 | * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT. |
| 1989 | */ |
| 1990 | if ( is_main_site() && is_404() && defined( 'NOBLOGREDIRECT' ) && ( $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ) ) ) { |
| 1991 | if ( $destination == '%siteurl%' ) |
| 1992 | $destination = network_home_url(); |
| 1993 | wp_redirect( $destination ); |
| 1994 | exit(); |
| 1995 | } |
| 1996 | } |
| 1997 | |
| 1998 | /** |
| 1999 | * Add a new user to a blog by visiting /newbloguser/username/. |