使用Spreadshirt API显示文章和结账链接

我正在尝试使用Spreadshirt API来显示产品/文章。

我现在需要添加一个下拉列表来选择每个产品的尺寸，并添加一个按钮来添加到购物篮中，然后使用spreadshirt结账。

<?php
    // This basket creation and checkout script shows you how to create a basket on the
    // Spreadshirt platform using Spreadshirt API v1 and forward customers to the
    // Spreadshirt checkout.
    // 1. Get shop data
    $shopUrl = "http://api.spreadshirt.net/api/v1/shops/665930";
    $ch = curl_init($shopUrl);
    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    $result = curl_exec($ch);
    // Close the handle
    curl_close($ch);
    $shop = new SimpleXMLElement($result);
    $namespaces = $shop->getNamespaces(true);
    // 2. Get article data
    $attributes = $shop->articles->attributes($namespaces['xlink']);
    $articlesUrl = $attributes->href;
    $ch = curl_init($articlesUrl . "?fullData=true");
    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    $result = curl_exec($ch);
    // Close the handle
    curl_close($ch);
    $articles = new SimpleXMLElement($result);
    $article = $articles->article[0];
    $attributes = $article->attributes($namespaces['xlink']);
    $articleUrl = $attributes->href;
    $appearanceId = "".$article->product->appearance['id'];
    $sizeId = null;
    // 3. Get product type data
    $attributes = $article->product->productType->attributes($namespaces['xlink']);
    $productTypeUrl = $attributes->href;
    $ch = curl_init($productTypeUrl);
    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    $result = curl_exec($ch);
    // Close the handle
    curl_close($ch);
    // 4. Find valid size
    $productType = new SimpleXMLElement($result);
    foreach ($productType->stockStates->stockState as $stockState) {
        if ($stockState->appearance['id'] == $appearanceId &&
            $stockState->available == "true") {
            $sizeId = $stockState->size['id'];
            break;
        }
    }
    // 5. Create basket
    $basket = new SimpleXMLElement(getFileData("basket.xml"));
    $basketItem = new SimpleXMLElement(getFileData("basketitem.xml"));
    $itemAttributes = $basketItem->element->attributes($namespaces['xlink']);
    $itemAttributes->href = $articleUrl;
    $basketItem->element->properties->property[0] = $appearanceId;
    $basketItem->element->properties->property[1] = $sizeId;
    $attributes = $shop->baskets->attributes($namespaces['xlink']);
    $basketsUrl = $attributes->href;
    $header = array();
    $header[] = createSprdAuthHeader("POST", $basketsUrl);
    $header[] = "Content-Type: application/xml";
    $ch = curl_init($basketsUrl);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $basket->asXML());
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    $result = curl_exec($ch);
    // Close the handle
    curl_close($ch);
    $basketUrl = parseHttpHeaders($result, "Location");
    // 6. Create basket item
    $basketItemsUrl = $basketUrl."/items";
    $header = array();
    $header[] = createSprdAuthHeader("POST", $basketItemsUrl);
    $header[] = "Content-Type: application/xml";
    $ch = curl_init($basketItemsUrl);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $basketItem->asXML());
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, true);
    $result = curl_exec($ch);
    // Close the handle
    curl_close($ch);
    // 7. Get checkout url
    $basketCheckoutUrl = $basketUrl."/checkout";
    $header = array();
    $header[] = createSprdAuthHeader("GET", $basketCheckoutUrl);
    $header[] = "Content-Type: application/xml";
    $ch = curl_init($basketCheckoutUrl);
    curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HEADER, false);
    $result = curl_exec($ch);
    // Close the handle
    curl_close($ch);
    $checkoutRef = new SimpleXMLElement($result);
    $refAttributes = $checkoutRef->attributes($namespaces['xlink']);
    $checkoutUrl = $refAttributes->href;
    echo '<html><body>';
    foreach ($articles->article as $article) {
        $resource = $article->resources->resource[0];
        $attributes = $resource->attributes($namespaces['xlink']);
    echo '<div style="clear:both;">';
echo '<div style="float: left; width: 150px; height: 150px;"><img src="' . $attributes->href . '?width=150&height=150" width="150" height="150"/></div>';
    echo 'Product ID is:' . (int)$article->product->attributes()->id . '</br>';
    echo 'Article ID is:' . (int)$article->attributes()->id . '</br>';
    echo 'Article Price is:' . $article->price[0]->vatIncluded[0] . '</br>';
    echo 'Article Name is:' . $article->name . '</br>';
    echo 'Article Description is:' . $article->description . '</br>';
    echo '<select id="size-select" name="size">';
    foreach($productType->sizes->size as $val) {
     echo '<option value="'.$val['id'].'">'.$val->name.'</option>' ;
    }
    echo '</select>';
    echo '</div>';
    }
    echo '</body></html>';
    function createSprdAuthHeader($method, $url) {
        $apiKey = "API";
        $secret = "SECRET";
        $time = time()*1000;
        $data = "$method $url $time";
        $sig = sha1("$data $secret");
        return "Authorization: SprdAuth apiKey='"$apiKey'", data='"$data'", sig='"$sig'"";
    }
    function parseHttpHeaders( $header, $headername ) {
        $retVal = array();
        $fields = explode("'r'n", preg_replace('/'x0D'x0A['x09'x20]+/', ' ', $header));
        foreach( $fields as $field ) {
            if( preg_match('/('.$headername.'): (.+)/m', $field, $match) ) {
                return $match[2];
            }
        }
        return $retVal;
    }
    function getFileData($file) {
        $fp = fopen($file, "r");
        $data = "";
        while(!feof($fp)) {
            $data .= fgets($fp, 1024);
        }
        fclose($fp);
        return $data;
    }
?>

谢谢。