RakutenRws_Client::execute PHP Method

    public function execute($operation, $parameter = array(), $version = null)
    {
        // remove '/' from operation
        $operation = preg_replace('/\\//', '', $operation);
        $className = 'RakutenRws_Api_Definition_' . $operation;
        if (!class_exists($className)) {
            throw new LogicException('Operation is not definied.');
        }
        $api = new $className($this, $this->options);
        if ($version !== null) {
            $api->setVersion($version);
        }
        return $api->execute($parameter);
    }

 private static function search($keyword)
 {
     if ($output = self::fetchCache($keyword)) {
         return $output;
     }
     $options = get_option('wp_rakuten_options');
     // 楽天商品検索
     $client = new RakutenRws_Client();
     $client->setApplicationId($options['developer_id']);
     $client->setAffiliateId($options['affiliate_id']);
     $response = $client->execute('IchibaItemSearch', array('keyword' => $keyword, 'availability' => '1', 'sort' => '+affiliateRate', 'hits' => 1));
     $html = '';
     foreach ($response as $item) {
         if ((int) $item['imageFlag'] === 1) {
             $html .= "<p>";
             $html .= "<a href=\"{$item['affiliateUrl']}\">";
             $html .= "<img src=\"{$item['mediumImageUrls'][0]['imageUrl']}\"><br />";
             $html .= "{$item['itemName']}</a>";
             $html .= "</p>";
         }
     }
     $output = '<!-- Rakuten Plugin Start -->';
     $output .= $html;
     $output .= '<!-- Rakuten Plugin End -->';
     self::createCache($keyword, $output);
     return $output;
 }