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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 |
---|---|
1895 | /** |
1896 | * Filter the redirect URL for 404s on the main site. |
1897 | * |
1898 | * The filter is only evaluated if the NOBLOGREDIRECT constant is defined. |
1899 | * |
1900 | * @since 3.0.0 |
1901 | * |
1902 | * @param string $no_blog_redirect The redirect URL defined in NOBLOGREDIRECT. |
1903 | */ |
1904 | if ( is_main_site() && is_404() && defined( 'NOBLOGREDIRECT' ) && ( $destination = apply_filters( 'blog_redirect_404', NOBLOGREDIRECT ) ) ) { |
1905 | if ( $destination == '%siteurl%' ) |
1906 | $destination = network_home_url(); |
1907 | wp_redirect( $destination ); |
1908 | exit(); |
1909 | } |
1910 | } |
1911 |
|
1912 | /** |
1913 | * Add a new user to a blog by visiting /newbloguser/username/. |