WP_User::get_site_id()

Gets the ID of the site for which the user’s capabilities are currently initialized.

Return

(int) Site ID.

Source

File: wp-includes/class-wp-user.php 

	public function get_site_id() {
		return $this->site_id;
	}

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Changelog

Changelog
Version Description
WP-4.9.0 Introduced.