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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 |
|---|---|
| 685 | * Filters the new site name during registration. |
| 686 | * |
| 687 | * The name is the site's subdomain or the site's subdirectory |
| 688 | * path depending on the network settings. |
| 689 | * |
| 690 | * @since MU (3.0.0) |
| 691 | * |
| 692 | * @param string $blogname Site name. |
| 693 | */ |
| 694 | $blogname = apply_filters( 'newblogname', $blogname ); |
| 695 | |
| 696 | $blog_title = wp_unslash( $blog_title ); |
| 697 | |
| 698 | if ( empty( $blog_title ) ) { |
| 699 | $errors->add( 'blog_title', __( 'Please enter a site title.' ) ); |
| 700 | } |
| 701 | |
| 702 | // Check if the domain/path has been used already. |
| 703 | if ( is_subdomain_install() ) { |