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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 |
|---|---|
| 591 | * Filters the new site name during registration. |
| 592 | * |
| 593 | * The name is the site's subdomain or the site's subdirectory |
| 594 | * path depending on the network settings. |
| 595 | * |
| 596 | * @since MU |
| 597 | * |
| 598 | * @param string $blogname Site name. |
| 599 | */ |
| 600 | $blogname = apply_filters( 'newblogname', $blogname ); |
| 601 | |
| 602 | $blog_title = wp_unslash( $blog_title ); |
| 603 | |
| 604 | if ( empty( $blog_title ) ) |
| 605 | $errors->add('blog_title', __( 'Please enter a site title.' ) ); |
| 606 | |
| 607 | // Check if the domain/path has been used already. |
| 608 | if ( is_subdomain_install() ) { |
| 609 | $mydomain = $blogname . '.' . preg_replace( '|^www\.|', '', $domain ); |