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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 |
|---|---|
| 597 | $illegal_names = array_merge( |
| 598 | $illegal_names, |
| 599 | /** |
| 600 | * Filter reserved site names on a sub-directory Multisite install. |
| 601 | * |
| 602 | * @since 3.0.0 |
| 603 | * |
| 604 | * @param array $subdirectory_reserved_names Array of reserved names. |
| 605 | */ |
| 606 | apply_filters( 'subdirectory_reserved_names', array( 'page', 'comments', 'blog', 'files', 'feed' ) ) |
| 607 | ); |
| 608 | } |
| 609 | |
| 610 | if ( empty( $blogname ) ) |
| 611 | $errors->add('blogname', __( 'Please enter a site name.' ) ); |
| 612 | |
| 613 | if ( preg_match( '/[^a-z0-9]+/', $blogname ) ) |
| 614 | $errors->add('blogname', __( 'Only lowercase letters (a-z) and numbers are allowed.' ) ); |
| 615 | |