add _reset_privacy_policy_page_for_post function

Author: masteradhoc

src/wp-includes/post.php

@@ -4027,6 +4027,26 @@ function _reset_front_page_settings_for_post( $post_id ) {
 	unstick_post( $post->ID );
 }
 
+/**
+ * Resets the Privacy Policy page ID option when the Privacy Policy page
+ * is deleted or trashed, to prevent uncached database queries for a
+ * non-existent page.
+ *
+ * @since 7.1.0
+ * @access private
+ *
+ * @param int $post_id The ID of the post being deleted or trashed.
+ */
+function _reset_privacy_policy_page_for_post( $post_id ) {
+	$post = get_post( $post_id );
+
+	if ( $post && 'page' === $post->post_type ) {
+		if ( (int) get_option( 'wp_page_for_privacy_policy' ) === (int) $post_id ) {
+			update_option( 'wp_page_for_privacy_policy', 0 );
+		}
+	}
+}
+
 /**
  * Moves a post or page to the Trash
  *