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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 |
|---|---|
| 2634 | /** |
| 2635 | * Filters reserved site names on a sub-directory Multisite installation. |
| 2636 | * |
| 2637 | * @since 3.0.0 |
| 2638 | * @since 4.4.0 'wp-admin', 'wp-content', 'wp-includes', 'wp-json', and 'embed' were added |
| 2639 | * to the reserved names list. |
| 2640 | * |
| 2641 | * @param array $subdirectory_reserved_names Array of reserved names. |
| 2642 | */ |
| 2643 | return apply_filters( 'subdirectory_reserved_names', $names ); |
| 2644 | } |
| 2645 | |
| 2646 | /** |
| 2647 | * Send a confirmation request email when a change of network admin email address is attempted. |
| 2648 | * |
| 2649 | * The new network admin address will not become active until confirmed. |
| 2650 | * |
| 2651 | * @since 4.9.0 |
| 2652 | * |