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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 |
|---|---|
| 634 | * Filter the new site name during registration. |
| 635 | * |
| 636 | * The name is the site's subdomain or the site's subdirectory |
| 637 | * path depending on the network settings. |
| 638 | * |
| 639 | * @since MU |
| 640 | * |
| 641 | * @param string $blogname Site name. |
| 642 | */ |
| 643 | $blogname = apply_filters( 'newblogname', $blogname ); |
| 644 | |
| 645 | $blog_title = wp_unslash( $blog_title ); |
| 646 | |
| 647 | if ( empty( $blog_title ) ) |
| 648 | $errors->add('blog_title', __( 'Please enter a site title.' ) ); |
| 649 | |
| 650 | // Check if the domain/path has been used already. |
| 651 | if ( is_subdomain_install() ) { |
| 652 | $mydomain = $blogname . '.' . preg_replace( '|^www\.|', '', $domain ); |