WordPress at a glance
function is not described

WP_Customize_Setting::set_root_value() protected WP 4.4.0

Set the root value for a setting, especially for multidimensional ones.

{} It's a method of the class: WP_Customize_Setting{}

No Hooks.

Return

true|false. Whether the multidimensional root was updated successfully.

Usage

// protected - for code of main (parent) or child class
$result = $this->set_root_value( $value );
$value(mixed) (required)
Value to set as root of multidimensional setting.

Changelog

Since 4.4.0 Introduced.

Code of WP_Customize_Setting::set_root_value() WP 5.7.2

<?php
protected function set_root_value( $value ) {
	$id_base = $this->id_data['base'];
	if ( 'option' === $this->type ) {
		$autoload = true;
		if ( isset( self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'] ) ) {
			$autoload = self::$aggregated_multidimensionals[ $this->type ][ $this->id_data['base'] ]['autoload'];
		}
		return update_option( $id_base, $value, $autoload );
	} elseif ( 'theme_mod' === $this->type ) {
		set_theme_mod( $id_base, $value );
		return true;
	} else {
		/*
		 * Any WP_Customize_Setting subclass implementing aggregate multidimensional
		 * will need to override this method to obtain the data from the appropriate
		 * location.
		 */
		return false;
	}
}