WordPressプラグイン CS ShopでYahooショッピング商品検索APIを使う方法

    /**
     * カテゴリ検索クエリ生成
     * @link http://developer.yahoo.co.jp/webapi/shopping/shopping/v1/categorysearch.html
     * @param string $category 対象カテゴリ
     * @return string RESTクエリ文字列
     */
    private function queryCategories($category)
    {
        if (empty($category)) {
            $category = 1;
        }
        $baseurl = "https://shopping.yahooapis.jp/ShoppingWebService/V1/categorySearch";
        $params = array();
        $params["appid"] = $this->account["appid"];
        $params["affiliate_type"] = "vc";
        $params["affiliate_id"] = $this->account["affiliate_id"];
        $params["category_id"] = $category;
        ksort($params);
        return $baseurl . "?" . http_build_query($params);
    }

    /**
     * 商品検索クエリ生成
     * @link http://developer.yahoo.co.jp/webapi/shopping/shopping/v1/itemsearch.html
     * @return string RESTクエリ文字列
     */
    private function queryItems()
    {
        $baseurl = "https://shopping.yahooapis.jp/ShoppingWebService/V1/itemSearch";
        $params = array();
        $params["appid"] = $this->account["appid"];
        $params["affiliate_type"] = "vc";
        $params["affiliate_id"] = $this->account["affiliate_id"];
        if (!empty($this->requests["keyword"])) {
            $params["query"] = $this->requests["keyword"];
        }
        if (!empty($this->requests["shop"])) {
            $params["store_id"] = $this->requests["shop"];
        }
        $params["type"] = "all";
        $params["category_id"] = empty($this->requests["category"]) ? "1" : $this->requests["category"];
        $params["hits"] = $this->requests["pagesize"];
        $params["offset"] = $this->requests["pagesize"] * ($this->requests["pagenum"] - 1);
        if (!empty($this->requests["sort"]) && array_key_exists($this->requests["sort"], $this->sortTypes)) {
            $params["sort"] = $this->sortTypes[$this->requests["sort"]];
        }
        $params["availability"] = "1";
        ksort($params);
        return $baseurl . "?" . http_build_query($params);
    }

/**
* 商品検索
* @link http://developer.yahoo.co.jp/webapi/shopping/shopping/v1/itemsearch.html
* @return array 商品情報の連想配列
*/
public function getItems() {
// RESTクエリ情報を取得
$query = $this->queryItems();
 // RESTクエリ実行
$strxml = $this->download($query, $query);
$objxml = simplexml_load_string($strxml);
$hash = array();
$itemcount = intval((string)$objxml->attributes()->totalResultsAvailable);
 if (0 < $itemcount) {
            $this->pages = ceil(min(1000, $itemcount) / $this->requests["pagesize"]);
            foreach ($objxml->Result->Hit as $node) {
                array_push($hash, array(
                        "name" => (string)$node->Name,
                        "price" => $this->formatPrice((string)$node->Price, (string)$node->Price->attributes()->currency, (string)$node->PriceLabel->attributes()->taxIncluded, (string)$node->Shipping->Code),
                        "desc" => (string)$node->Description,
                        "shop" => (string)$node->Store->Name,
                        "score" => floatval((string)$node->Review->Rate),
                        "aurl" => (string)$node->Url,
                        "iurl" => empty($this->requests["mobile"]) ? (string)$node->Image->Medium : (string)$node->Image->Small,
                        "trak" => '<img src="//ad.jp.ap.valuecommerce.com/servlet/gifbanner?sid=■■■■■■■&pid=●●●●●●●●" height="1" width="0" border="0">',				    
                        "surl" => (string)$node->Store->Url
                    )
                );
            }

/**
 * 商品一覧
 * @param array $params 要求パラメタ
 * @param array $items 商品情報の連想配列を格納した配列
 * @return string 出力コンテンツ
 */
function showItems(&$params, &$items)
{
    // 出力コンテンツ
    $output = "";
    // PC・携帯電話の判定
    if (empty($params["mobile"])) {
        // PCの場合
        foreach ($items as $item) {
            $item_escaped["name"] = o_escape(mb_strimwidth($item["name"], 0, 128, "..", "UTF-8"));
            $item_escaped["desc"] = o_escape(mb_strimwidth($item["desc"], 0, 256, "..", "UTF-8"), true);
            if (!empty($item["surl"])) {
                $shopicon = "<img src=\"https://favicon.hatena.ne.jp/?url=" . urlencode($item["surl"]) . "\" /> ";
            } else {
                $shopicon = "";
            }
            $imageurl = empty($item['iurl']) ? CS_SHOP_URL . "/no-image.gif" : $item['iurl'];
            $shopname = empty($item['shop']) ? "詳細" : $item['shop'];
            $scorelevel = empty($item['score']) ? "" : getScoreLevel($item['score']) . " 評価 " . $item['score'];
            $trak = empty($item['trak']) ? "" : $item['trak'];
            $output .= <<< EOT
<div class="csshop-item">
<h3>{$item_escaped['name']}</h3>
<div class="image"><a href="{$item['aurl']}" target="_blank"><img src="{$imageurl}" alt="{$item_escaped['name']}" width="128" />{$trak}</a></div>
<div class="price">{$item['price']}</div>
<div class="shop">{$shopicon}<a href="{$item['aurl']}" target="_blank">{$shopname}{$trak}</a></div>
<div class="score">{$scorelevel}</div>
<div class="description">{$item_escaped['desc']}</div>
</div>\n
EOT;
        }