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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 |
|---|---|
| 38 | |
| 39 | $blog = $_POST['blog']; |
| 40 | $domain = ''; |
| 41 | if ( preg_match( '|^([a-zA-Z0-9-])+$|', $blog['domain'] ) ) |
| 42 | $domain = strtolower( $blog['domain'] ); |
| 43 | |
| 44 | // If not a subdomain install, make sure the domain isn't a reserved word |
| 45 | if ( ! is_subdomain_install() ) { |
| 46 | /** This filter is documented in wp-includes/ms-functions.php */ |
| 47 | $subdirectory_reserved_names = apply_filters( 'subdirectory_reserved_names', array( 'page', 'comments', 'blog', 'files', 'feed' ) ); |
| 48 | if ( in_array( $domain, $subdirectory_reserved_names ) ) |
| 49 | wp_die( sprintf( __('The following words are reserved for use by WordPress functions and cannot be used as blog names: <code>%s</code>' ), implode( '</code>, <code>', $subdirectory_reserved_names ) ) ); |
| 50 | } |
| 51 | |
| 52 | $title = $blog['title']; |
| 53 | |
| 54 | if ( empty( $domain ) ) |
| 55 | wp_die( __( 'Missing or invalid site address.' ) ); |
| 56 | |