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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 |
---|---|
2043 | /** |
2044 | * Filters the redirect URL for 404s on the main site. |
2045 | * |
2046 | * The filter is only evaluated if the NOBLOGREDIRECT constant is defined. |
2047 | * |
2048 | * @since 3.0.0 |
2049 | * |
2050 | * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT. |
2051 | */ |
2052 | $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ); |
2053 | if ( $destination ) { |
2054 | if ( $destination == '%siteurl%' ) { |
2055 | $destination = network_home_url(); |
2056 | } |
2057 | wp_redirect( $destination ); |
2058 | exit(); |
2059 | } |
2060 | } |
2061 | } |