php

Question

我创建了亚马逊Api来获取php中的产品。但它总是显示＆＃39; SignatureDoesNotMatch＆＃39;。我已经与这个＆＃39; http://associates-amazon.s3.amazonaws.com/signed-requests/helper/index.html＆＃39;匹配了。它并不匹配。我想知道这段代码有什么问题。

$AWS_ACCESS_KEY_ID = "[myaccesskeyhere]";
$AWS_SECRET_ACCESS_KEY = "[mysecretkeyhere]";

$base_url = "http://ecs.amazonaws.com/onca/xml?";
$url_params = array('Operation'=>"ItemSearch",'Service'=>"AWSECommerceService",
 'AWSAccessKeyId'=>$AWS_ACCESS_KEY_ID,'AssociateTag'=>"yourtag-10",
 'Version'=>"2006-09-11",'Availability'=>"Available",'Condition'=>"All",
 'ItemPage'=>"1",'ResponseGroup'=>"Images,ItemAttributes,EditorialReview",
 'Keywords'=>"Amazon");

// Add the Timestamp
$url_params['Timestamp'] = gmdate("Y-m-d\TH:i:s.\\0\\0\\0\\Z", time());

// Sort the URL parameters
$url_parts = array();
foreach(array_keys($url_params) as $key)
    $url_parts[] = $key."=".$url_params[$key];
sort($url_parts);

// Construct the string to sign
$string_to_sign = "GET\necs.amazonaws.com\n/onca/xml\n".implode("&",$url_parts);
$string_to_sign = str_replace('+','%20',$string_to_sign);
$string_to_sign = str_replace(':','%3A',$string_to_sign);
$string_to_sign = str_replace(';',urlencode(';'),$string_to_sign);

// Sign the request
$signature = hash_hmac("sha256",$string_to_sign,$AWS_SECRET_ACCESS_KEY,TRUE);

// Base64 encode the signature and make it URL safe
$signature = base64_encode($signature);
$signature = str_replace('+','%2B',$signature);
$signature = str_replace('=','%3D',$signature);

$url_string = implode("&",$url_parts);
$url = $base_url.$url_string."&Signature=".$signature;
print $url;