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Mailchimp_Helpers::compile_user_interests( mixed $existing_user, mixed $change_groups,  $groups_list )

	public function compile_user_interests( $existing_user, $change_groups, $groups_list ) {
		// Only add new interests
		if ( 'add-only' === $change_groups ) {
			if ( empty( $groups_list ) ) {
				// No interests to add
				return array();
			}
			$add_interests = array();
			foreach ( $groups_list as $interest_id ) {
				$add_interests[ $interest_id ] = true;
			}
			return $add_interests;
		}
		// Remove any matching interests
		if ( 'replace-matching' === $change_groups ) {
			if ( empty( $groups_list ) ) {
				// No interests to remove
				return array();
			}
			$remove_interests = array();
			foreach ( $groups_list as $interest_id ) {
				$remove_interests[ $interest_id ] = false;
			}
			return $remove_interests;
		}
		// Replace All. All of the subscriber's existing groups will be cleared, and replaced with the groups selected below.
		if ( 'replace-all' === $change_groups ) {
			$new_interests = array();
			if ( ! empty( $existing_user['data']['interests'] ) ) {
				// First remove all interests
				foreach ( $existing_user['data']['interests'] as $interest_id => $status ) {
					$new_interests[ $interest_id ] = false;
				}
			}
			// Then add the new ones
			foreach ( $groups_list as $interest_id ) {
				$new_interests[ $interest_id ] = true;
			}
			return $new_interests;
		}
		return array();
	}