<?php
require 'vendor/autoload.php';

use Aws\ProductAdvertising\ProductAdvertisingClient;
use Aws\Credentials\Credentials;

$associateTag = 'YOUR_ASSOCIATE_TAG';
$accessKey = 'YOUR_ACCESS_KEY';
$secretKey = 'YOUR_SECRET_KEY';

$credentials = new Credentials($accessKey, $secretKey);

$client = new ProductAdvertisingClient([
    'credentials' => $credentials,
    'region' => 'us-east-1',
    'version' => 'latest'
]);

try {
    $result = $client->searchItems([
        'Keywords' => 'iPhone',
        'SearchIndex' => 'Electronics',
        'Resources' => ['Images.Primary.Medium', 'ItemInfo.Title'],
        'PartnerTag' => $associateTag,
        'PartnerType' => 'Associates'
    ]);
    
    print_r($result);
} catch (Exception $e) {
    echo 'Error: ', $e->getMessage(), "\n";
}
?>

<?php
function amazonProductApiRequest($params) {
    $public_key = "YOUR_ACCESS_KEY";
    $private_key = "YOUR_SECRET_KEY";
    $associate_tag = "YOUR_ASSOCIATE_TAG";
    
    $method = "GET";
    $host = "webservices.amazon.com";
    $uri = "/onca/xml";
    
    // 添加必要参数
    $params["Service"] = "AWSECommerceService";
    $params["AWSAccessKeyId"] = $public_key;
    $params["AssociateTag"] = $associate_tag;
    $params["Timestamp"] = gmdate("Y-m-d\TH:i:s\Z");
    $params["Version"] = "2013-08-01";
    
    // 排序参数
    ksort($params);
    
    // 创建规范化的查询字符串
    $canonicalized_query = array();
    foreach ($params as $param => $value) {
        $param = str_replace("%7E", "~", rawurlencode($param));
        $value = str_replace("%7E", "~", rawurlencode($value));
        $canonicalized_query[] = $param . "=" . $value;
    }
    $canonicalized_query = implode("&", $canonicalized_query);
    
    // 创建待签名的字符串
    $string_to_sign = $method . "\n" . $host . "\n" . $uri . "\n" . $canonicalized_query;
    
    // 计算签名
    $signature = base64_encode(hash_hmac("sha256", $string_to_sign, $private_key, true));
    $signature = str_replace("%7E", "~", rawurlencode($signature));
    
    // 创建请求URL
    $url = "https://" . $host . $uri . "?" . $canonicalized_query . "&Signature=" . $signature;
    
    // 发送请求
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 15);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
    
    $response = curl_exec($ch);
    curl_close($ch);
    
    return $response;
}

// 示例：搜索产品
$params = array(
    "Operation" => "ItemSearch",
    "SearchIndex" => "Books",
    "Keywords" => "PHP programming",
    "ResponseGroup" => "ItemAttributes,Offers,Images"
);

$xml_response = amazonProductApiRequest($params);
$parsed_xml = simplexml_load_string($xml_response);
print_r($parsed_xml);
?>