WP_Roles::for_site( int $site_id = null )

Source

public function for_site( $site_id = null ) {
	global $wpdb;

	if ( ! empty( $site_id ) ) {
		$this->site_id = absint( $site_id );
	} else {
		$this->site_id = get_current_blog_id();
	}

	$this->role_key = $wpdb->get_blog_prefix( $this->site_id ) . 'user_roles';

	if ( ! empty( $this->roles ) && ! $this->use_db ) {
		return;
	}

	$this->roles = $this->get_roles_data();

	$this->init_roles();
}

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