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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 |
|---|---|
| 542 | $errors = new WP_Error(); |
| 543 | $illegal_names = get_site_option( 'illegal_names' ); |
| 544 | if ( $illegal_names == false ) { |
| 545 | $illegal_names = array( 'www', 'web', 'root', 'admin', 'main', 'invite', 'administrator' ); |
| 546 | add_site_option( 'illegal_names', $illegal_names ); |
| 547 | } |
| 548 | |
| 549 | // On sub dir installs, Some names are so illegal, only a filter can spring them from jail |
| 550 | if (! is_subdomain_install() ) |
| 551 | $illegal_names = array_merge($illegal_names, apply_filters( 'subdirectory_reserved_names', array( 'page', 'comments', 'blog', 'files', 'feed' ) ) ); |
| 552 | |
| 553 | if ( empty( $blogname ) ) |
| 554 | $errors->add('blogname', __( 'Please enter a site name.' ) ); |
| 555 | |
| 556 | if ( preg_match( '/[^a-z0-9]+/', $blogname ) ) |
| 557 | $errors->add('blogname', __( 'Only lowercase letters (a-z) and numbers are allowed.' ) ); |
| 558 | |
| 559 | if ( in_array( $blogname, $illegal_names ) == true ) |
| 560 | $errors->add('blogname', __( 'That name is not allowed.' ) ); |