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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 |
---|---|
2226 | /** |
2227 | * Filters the redirect URL for 404s on the main site. |
2228 | * |
2229 | * The filter is only evaluated if the NOBLOGREDIRECT constant is defined. |
2230 | * |
2231 | * @since 3.0.0 |
2232 | * |
2233 | * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT. |
2234 | */ |
2235 | $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ); |
2236 |
|
2237 | if ( $destination ) { |
2238 | if ( '%siteurl%' === $destination ) { |
2239 | $destination = network_home_url(); |
2240 | } |
2241 |
|
2242 | wp_redirect( $destination ); |
2243 | exit; |
2244 | } |