Source

File: wp-includes/class-wp-customize-setting.php

final protected function multidimensional_replace( $root, $keys, $value ) {
		if ( ! isset( $value ) ) {
			return $root;
		} elseif ( empty( $keys ) ) { // If there are no keys, we're replacing the root.
			return $value;
		}

		$result = $this->multidimensional( $root, $keys, true );

		if ( isset( $result ) ) {
			$result['node'][ $result['key'] ] = $value;
		}

		return $root;
	}