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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 | 
|---|---|
| 603 |       * Filters the new site name during registration. | 
| 604 |       * | 
| 605 |       * The name is the site's subdomain or the site's subdirectory | 
| 606 |       * path depending on the network settings. | 
| 607 |       * | 
| 608 |       * @since MU | 
| 609 |       * | 
| 610 |       * @param string $blogname Site name. | 
| 611 |       */ | 
| 612 |      $blogname = apply_filters( 'newblogname', $blogname ); | 
| 613 |  | 
| 614 |      $blog_title = wp_unslash(  $blog_title ); | 
| 615 |  | 
| 616 |      if ( empty( $blog_title ) ) | 
| 617 |           $errors->add('blog_title', __( 'Please enter a site title.' ) ); | 
| 618 |  | 
| 619 |      // Check if the domain/path has been used already. | 
| 620 |      if ( is_subdomain_install() ) { | 
| 621 |           $mydomain = $blogname . '.' . preg_replace( '|^www\.|', '', $domain ); |