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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 |
|---|---|
| 2022 | /** |
| 2023 | * Filters the redirect URL for 404s on the main site. |
| 2024 | * |
| 2025 | * The filter is only evaluated if the NOBLOGREDIRECT constant is defined. |
| 2026 | * |
| 2027 | * @since 3.0.0 |
| 2028 | * |
| 2029 | * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT. |
| 2030 | */ |
| 2031 | if ( is_main_site() && is_404() && defined( 'NOBLOGREDIRECT' ) && ( $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ) ) ) { |
| 2032 | if ( $destination == '%siteurl%' ) |
| 2033 | $destination = network_home_url(); |
| 2034 | wp_redirect( $destination ); |
| 2035 | exit(); |
| 2036 | } |
| 2037 | } |
| 2038 | |
| 2039 | /** |
| 2040 | * Add a new user to a blog by visiting /newbloguser/username/. |