WC_Data::read_meta_data PHP Method

    public function read_meta_data($force_read = false)
    {
        $this->meta_data = array();
        $cache_loaded = false;
        if (!$this->get_id()) {
            return;
        }
        if (!$this->data_store) {
            return;
        }
        if (!empty($this->cache_group)) {
            $cache_key = WC_Cache_Helper::get_cache_prefix($this->cache_group) . 'object_meta_' . $this->get_id();
        }
        if (!$force_read) {
            if (!empty($this->cache_group)) {
                $cached_meta = wp_cache_get($cache_key, $this->cache_group);
                if (false !== $cached_meta) {
                    $this->meta_data = $cached_meta;
                    $cache_loaded = true;
                }
            }
        }
        if (!$cache_loaded) {
            $raw_meta_data = $this->data_store->read_meta($this);
            if ($raw_meta_data) {
                foreach ($raw_meta_data as $meta) {
                    $this->meta_data[] = (object) array('id' => (int) $meta->meta_id, 'key' => $meta->meta_key, 'value' => maybe_unserialize($meta->meta_value));
                }
                if (!empty($this->cache_group)) {
                    wp_cache_set($cache_key, $this->meta_data, $this->cache_group);
                }
            }
        }
    }