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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 |
---|---|
2099 | /** |
2100 | * Filters the redirect URL for 404s on the main site. |
2101 | * |
2102 | * The filter is only evaluated if the NOBLOGREDIRECT constant is defined. |
2103 | * |
2104 | * @since 3.0.0 |
2105 | * |
2106 | * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT. |
2107 | */ |
2108 | if ( is_main_site() && is_404() && defined( 'NOBLOGREDIRECT' ) && ( $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ) ) ) { |
2109 | if ( $destination == '%siteurl%' ) { |
2110 | $destination = network_home_url(); |
2111 | } |
2112 | wp_redirect( $destination ); |
2113 | exit(); |
2114 | } |
2115 | } |
2116 |
|
2117 | /** |