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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 |
|---|---|
| 3060 | /** |
| 3061 | * Fires immediately before the setting is registered but after its filters are in place. |
| 3062 | * |
| 3063 | * @since 5.5.0 |
| 3064 | * |
| 3065 | * @param string $option_group Setting group. |
| 3066 | * @param string $option_name Setting name. |
| 3067 | * @param array $args Array of setting registration arguments. |
| 3068 | */ |
| 3069 | do_action( 'register_setting', $option_group, $option_name, $args ); |
| 3070 | |
| 3071 | $wp_registered_settings[ $option_name ] = $args; |
| 3072 | } |
| 3073 | |
| 3074 | /** |
| 3075 | * Unregisters a setting. |
| 3076 | * |
| 3077 | * @since 2.7.0 |
| 3078 | * @since 4.7.0 `$sanitize_callback` was deprecated. The callback from `register_setting()` is now used instead. |