function grabNextpage($arrUrlFormat, $yhd_cid)
{
    $page = 1;
    while (true) {
        foreach ($arrUrlFormat as $key => $urlFormat) {
            $url = sprintf($urlFormat, $page);
            try {
                $response = grabWebPage($url);
            } catch (Exception $e) {
                println('backup hit, skip');
                continue;
            }
            $json = json_decode($response, true);
            $html = $json['value'];
            if (!findItems($html, $yhd_cid)) {
                break 2;
            }
            //  backup
            pageBackup($url, $response);
        }
        $page++;
    }
}
function defHP()
{
    findItems();
    echo "\n                <div class='col-sm-4'>\n                    <div class='panel-group'>\n                        <div class='panel panel-primary'>\n                            <div class='panel-heading basecolours'>\n                                <h1>Search for an item</h1>\n                            </div>\n                            <div class='panel-body basecolours' align='center'>\n                                <form class='input-group' role='form' method='get' action='search.php' >\n                                    <input type='text' name='search' class='form-control' id='search' placeholder='Search...' >\n                                        <span class='input-group-btn''>\n                                            <button class='btn btn-primary' type='submit' value='Submit'>\n                                                <span class='glyphicon glyphicon-search'></span>\n                                            </button>\n                                        </span>\n                                </form>\n                            </div>\n                        </div>\n                    </div>\n                </div>\n            </div>\n\n            ";
    topItems();
}