Use KAKAKU.com Web API with PHP

//-------------------------------------------------------------------
// Define your id.
//-------------------------------------------------------------------
// user id information
define("ACCESS_KEY_ID"     , 'Your KAKAKKU.com Web API id.    ');
 
// access url(Jpanan)
define("ACCESS_URL"        , 'http://api.kakaku.com/WebAPI/ItemSearch/Ver1.0/ItemSearch.aspx');
//-------------------------------------------------------------------
//http://api.kakaku.com/WebAPI/ItemSearch/Ver1.0/ProviderSearch.aspx -- プロバイダ検索API
 
 
//-------------------------------------------------------------------
// this function is encode with RFC3986 format.
//-------------------------------------------------------------------
function urlencode_RFC3986($str)
{
    return str_replace('%7E', '~', rawurlencode($str));
}
 
 
//-------------------------------------------------------------------
// Main routine.
//-------------------------------------------------------------------
 
$base_param = 'ApiKey='.ACCESS_KEY_ID;
 
$params = array();
 
$params['SortOrder']        = 'pricerank';  //	price/name/score/sold/affiliate/review_count (+/-)
$params['CategoryGroup']    = 'Pc';         //	category (pc/software)
$params['Keyword']          = 'Windows 7 Microsoft';        // search key ( UTF-8 )
$params['HitNum']           = 10;	//	result max count.
$params['PageNum']          = 1;	//	start page no
$params['Charset']          = 'utf8';	//	charactor code
$params['ResultSet']        = 'medium';	//	result info
 
// sort $param by asc.
ksort($params);
 
// create canonical string.
$canonical_string = $base_param;
foreach ($params as $k => $v) {
    $canonical_string .= '&'.urlencode_RFC3986($k).'='.urlencode_RFC3986($v);
}
 
// create URL strings.
$url = ACCESS_URL.'?'.$canonical_string;	//	service = itemSearch 
 
// request to amazon !!
$response = file_get_contents($url);
 
// response to strings.
$parsed_xml = null;
if(isset($response)){
	$parsed_xml = simplexml_load_string($response);
}
 
$err_count=0;
 
// print out of response.
if( $response && 
    isset($parsed_xml) && 
    !isset($parsed_xml->Error)  ){
 
	// total results num.
	$total_results = $parsed_xml->NumOfResult;
	// total results pages.
	$total_pages = floor(($parsed_xml->NumOfResult + 9)/10);
 
	print("All Result Count:".$total_results."  | Pages :".$total_pages );
 
	print("<table>");
	foreach($parsed_xml->Item as $current){
		$nerr=0;
 
		print('<tr><td><font size="-1">');
 
		print('<a href="'.$current->ItemPageUrl.'"><img src="'.$current-- alt="" />ImageUrl.'" border="0"></a>');
		print('<a href="'.$current->ItemPageUrl.'">'.$current->ProductName.'</a>');
		print('Maker : '.$current->MakerName.'');
 
		print('<font color="red">Sale : '.$current->LowestPrice.'</font>');
 
		if(isset($current->PvRanking) && !empty($current->PvRanking) ){
			print('Ranking : '.$current->PvRanking.'');
		}
		if(isset($current->TotalScoreAve) && !empty($current->TotalScoreAve) ){
			print('Rate : '.$current->TotalScoreAve.'');
		}
		if(isset($current->Comment) && !empty($current->Comment) ){
			print('Spec : '.$current->Comment.'');
		}
		print("</td>
</tr>
");
	}
	print("</table>
");
	print('<a href="http://apiblog.kakaku.com/">WEB Services by 価格.com</a>');
}