設定

WC()->session->set($key, $value);

取得

WC()->session->get($key);

Service

<?php
namespace Plugin\App\Services;

class SessionService
{
    public static function set($key, $value)
    {
        WC()->session->set($key, $value);
        return self::get($key);
    }

    public static function get($key, $def = false)
    {
        $value = WC()->session->get($key);
        return $value ? $value : $def;
    }
}