WC_Session_Handler::save_data │ public │ WC 1.0

Save data and delete guest session.

Method of the class: WC_Session_Handler{}

No Hooks.

Returns

null. Nothing (null).

Usage

$WC_Session_Handler = new WC_Session_Handler();
$WC_Session_Handler->save_data( $old_session_key );
$old_session_key(string|mixed)
Optional session ID prior to user log-in. If $old_session_key is not tied to a user, the session will be deleted with the assumption that it was migrated to the current session being saved.
Default: ''

WC_Session_Handler::save_data() code WC 9.9.3

woocommerce/includes/class-wc-session-handler.php 
public function save_data( $old_session_key = '' ) {
	// Dirty if something changed - prevents saving nothing new.
	if ( $this->_dirty && $this->has_session() ) {
		global $wpdb;

		$wpdb->query(
			$wpdb->prepare(
				// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
				"INSERT INTO $this->_table (`session_key`, `session_value`, `session_expiry`) VALUES (%s, %s, %d)
 					ON DUPLICATE KEY UPDATE `session_value` = VALUES(`session_value`), `session_expiry` = VALUES(`session_expiry`)",
				$this->_customer_id,
				maybe_serialize( $this->_data ),
				$this->_session_expiration
			)
		);
		wp_cache_set( $this->get_cache_prefix() . $this->_customer_id, $this->_data, WC_SESSION_CACHE_GROUP, $this->_session_expiration - time() );
		$this->_dirty = false;

		/**
		 * Ideally, the removal of guest session data migrated to a logged-in user would occur within
		 * self::init_session_cookie() upon user login detection initially occurs. However, since some third-party
		 * extensions override this method, relocating this logic could break backward compatibility.
		 */
		if ( ! empty( $old_session_key ) && $this->_customer_id !== $old_session_key && ! is_object( get_user_by( 'id', $old_session_key ) ) ) {
			$this->delete_session( $old_session_key );
		}
	}
}