From e3df1300892ecbbe9a1645d7ce63d1267569bfc8 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Sun, 5 Jul 2020 15:05:02 +0000
Subject: [PATCH] Options, Meta APIs: Introduce `register_setting` and
 `unregister_setting` actions.

Props Howdy_McGee, Pionect.
Fixes #37245.

git-svn-id: https://develop.svn.wordpress.org/trunk@48321 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/option.php | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/src/wp-includes/option.php b/src/wp-includes/option.php
index 459b355362..be81bd25ad 100644
--- a/src/wp-includes/option.php
+++ b/src/wp-includes/option.php
@@ -2212,6 +2212,7 @@ function register_setting( $option_group, $option_name, $args = array() ) {
 	}
 
 	$new_whitelist_options[ $option_group ][] = $option_name;
+
 	if ( ! empty( $args['sanitize_callback'] ) ) {
 		add_filter( "sanitize_option_{$option_name}", $args['sanitize_callback'] );
 	}
@@ -2219,6 +2220,17 @@ function register_setting( $option_group, $option_name, $args = array() ) {
 		add_filter( "default_option_{$option_name}", 'filter_default_option', 10, 3 );
 	}
 
+	/**
+	 * Fires immediately before the setting is registered but after its filters are in place.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param string $option_group Setting group.
+	 * @param string $option_name  Setting name.
+	 * @param array  $args         Array of setting registration arguments.
+	 */
+	do_action( 'register_setting', $option_group, $option_name, $args );
+
 	$wp_registered_settings[ $option_name ] = $args;
 }
 
@@ -2231,9 +2243,9 @@ function register_setting( $option_group, $option_name, $args = array() ) {
  * @global array $new_whitelist_options
  * @global array $wp_registered_settings
  *
- * @param string   $option_group      The settings group name used during registration.
- * @param string   $option_name       The name of the option to unregister.
- * @param callable $deprecated        Deprecated.
+ * @param string   $option_group The settings group name used during registration.
+ * @param string   $option_name  The name of the option to unregister.
+ * @param callable $deprecated   Deprecated.
  */
 function unregister_setting( $option_group, $option_name, $deprecated = '' ) {
 	global $new_whitelist_options, $wp_registered_settings;
@@ -2265,9 +2277,11 @@ function unregister_setting( $option_group, $option_name, $deprecated = '' ) {
 	}
 
 	$pos = array_search( $option_name, (array) $new_whitelist_options[ $option_group ], true );
+
 	if ( false !== $pos ) {
 		unset( $new_whitelist_options[ $option_group ][ $pos ] );
 	}
+
 	if ( '' !== $deprecated ) {
 		_deprecated_argument(
 			__FUNCTION__,
@@ -2293,6 +2307,16 @@ function unregister_setting( $option_group, $option_name, $deprecated = '' ) {
 			remove_filter( "default_option_{$option_name}", 'filter_default_option', 10 );
 		}
 
+		/**
+		 * Fires immediately before the setting is unregistered and after its filters have been removed.
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param string $option_group Setting group.
+		 * @param string $option_name  Setting name.
+		 */
+		do_action( 'unregister_setting', $option_group, $option_name );
+
 		unset( $wp_registered_settings[ $option_name ] );
 	}
 }