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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 |
|---|---|
| 2421 | /** |
| 2422 | * Fires immediately before the setting is registered but after its filters are in place. |
| 2423 | * |
| 2424 | * @since 5.5.0 |
| 2425 | * |
| 2426 | * @param string $option_group Setting group. |
| 2427 | * @param string $option_name Setting name. |
| 2428 | * @param array $args Array of setting registration arguments. |
| 2429 | */ |
| 2430 | do_action( 'register_setting', $option_group, $option_name, $args ); |
| 2431 | |
| 2432 | $wp_registered_settings[ $option_name ] = $args; |
| 2433 | } |
| 2434 | |
| 2435 | /** |
| 2436 | * Unregisters a setting. |
| 2437 | * |
| 2438 | * @since 2.7.0 |
| 2439 | * @since 4.7.0 `$sanitize_callback` was deprecated. The callback from `register_setting()` is now used instead. |