你所指的魔法发生在redirect_canonical(). 更具体地说，redirect_guess_404_permalink().

你可以提前切入redirect_canonical 通过钩住template_redirect 优先级稍高的操作-在这种情况下，任何低于10.

function wpse_145210_redirect_canonical() {
    if ( is_404() && $name = get_query_var( \'name\' ) ) {
        // The following is straight from redirect_guess_404_permalink(), do whatever you want instead!

        $where = $wpdb->prepare("post_name LIKE %s", like_escape( $name ) . \'%\');

        // if any of post_type, year, monthnum, or day are set, use them to refine the query
        if ( get_query_var(\'post_type\') )
            $where .= $wpdb->prepare(" AND post_type = %s", get_query_var(\'post_type\'));
        else
            $where .= " AND post_type IN (\'" . implode( "\', \'", get_post_types( array( \'public\' => true ) ) ) . "\')";

        if ( get_query_var(\'year\') )
            $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var(\'year\'));
        if ( get_query_var(\'monthnum\') )
            $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var(\'monthnum\'));
        if ( get_query_var(\'day\') )
            $where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var(\'day\'));

        $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = \'publish\'");
        if ( ! $post_id )
            return false;

        if ( get_query_var( \'feed\' ) )
            $url = get_post_comments_feed_link( $post_id, get_query_var( \'feed\' ) );
        elseif ( get_query_var( \'page\' ) )
            $url = trailingslashit( get_permalink( $post_id ) ) . user_trailingslashit( get_query_var( \'page\' ), \'single_paged\' );
        else
            $url = get_permalink( $post_id );

        wp_redirect( $url, 301 );
        exit;
    }
}

add_action( \'template_redirect\', \'wpse_145210_redirect_canonical\', 5 );