감사합니다.^^

조금 더 보강합니다.
네이버에서 리턴되는 링크가 지식쇼핑으로만 되어있어서
가격비교대상이 없는 상품은 내용이 없는 페이지가 나오게 됩니다.

그래서 그럴때는 상품 정보 페이지가 보이도록 수정하였습니다.

이하 소스입니다.
------------------------------------------------------------------------------------------------------------------------------------------------------
<?php

$q = (!empty($_GET['q'])) ? $_GET['q'] : '';
$q_decode = (!empty($q)) ? stripslashes(urldecode($q)) : '';
$q_enocde = urlencode($q);

$start = (!empty($_GET['start']) && is_numeric($_GET['start'])) ? $_GET['start'] : 1;
$display = (!empty($_GET['display']) && is_numeric($_GET['display'])) ? $_GET['display'] : 5;
$sort = (!empty($_GET['sort'])) ? $_GET['sort'] : 'sim';
$temp = $sort . "_selected";
$$temp = " selected";

?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=UTF-8'>
<title> 쇼핑 검색 </title>
</head>

<body>
<center>
<form name='shop_search_form' method='GET'>
<input type=text name='q' value='<?=$q_decode?>'> <input type='submit' value='search'>

start <input type=text name='start' value='<?=$start?>' size=3>
display <input type=text name='display' value='<?=$display?>' size=3>
sort
<select name='sort' onchange='document.shop_search_form.submit();'>
<option value='sim' <?=$sim_selected?>>인기상품순</option>
<option value='date' <?=$date_selected?>>신상품순</option>
<option value='asc' <?=$asc_selected?>>낮은가격순</option>
<option value='dsc' <?=$dsc_selected?>>높은가격순</option>
</select>
</form>
<table width=600 border=1 cellspacing=3>
<?php

if (!empty($q_decode)) {

$naver_openapi_key = '자신이 네이버에서 발급받은 키를 넣으세요';
$file = 'http://openapi.naver.com/search?key=' . $naver_openapi_key . '&query=' . $q_enocde . '&display=' . $display . '&start=' . $start . '&target=shop&sort=' . $sort;
$fp = fopen($file, 'r') or die($file . ' not found');

$text = '';
while($data = fread($fp, 4096)){

$text .= $data;
}

fclose($fp);

preg_match_all("`<item>[^<]*<title>([^<]*)</title>[^<]*<link>([^<]*)</link>[^<]*(<image>([^<]*)</image>)?(<image/>)?[^<]*(<lprice>([^<]*)</lprice>)?(<lprice/>)?[^<]*(<hprice>([^<]*)</hprice>)?(<hprice/>)?[^<]*(<description>([^<]*)</description>)?(<description/>)?`s", $text, $matches);

if (is_array($matches[1]) && count($matches[1]) > 0){

foreach($matches[1] as $key => $val){

//title
$title = str_replace(array("<", ">"), array("<", ">"), $val);

//link
$link = $matches[2][$key];

//image
if (empty($matches[4][$key])) $image = '정보없음';
else $image = "<img src='" . $matches[4][$key] . "'>";

//lprice
if (empty($matches[7][$key])) $lprice = '정보없음';
else $lprice = number_format($matches[7][$key]) . " 원";

//hprice
if (empty($matches[10][$key])) $hprice = '정보없음';
else $hprice = number_format($matches[10][$key]) . " 원";

//description
if (empty($matches[13][$key])) {

$description = '정보없음';
if ($hprice == '정보없음') {

if ($lprice == '정보없음') {// 가격 정보가 아예 하나도 없는 것은 도서검색인것 같음

$link = preg_replace("|^.+nv_mid=([0-9]+).*$|", "http://book.naver.com/bookdb/book_detail.php?bid=\\1", $link);
}
else {//가격비교 정보가 없는것들

$link = preg_replace("|^.+\?(.+)$|", "http://shopping.naver.com/go.nhn?\\1&refer=search", $link);
}
}
}
else $description = str_replace(array("<", ">"), array("<", ">"), $matches[13][$key]);

echo "<tr align='center'>";
echo "<td width='100'> <a href='" . $link . "' target='_blank'>" . $title . "</a> </td>";
echo "<td width='180'>" . $image . "</td>";
echo "<td width='100'>" . $lprice . "<br>" . $hprice . "</td>";
echo "<td>" . $description . "</td>";
echo "</tr>";
}
}
else echo "<tr><td>검색결과 없음</td></tr>";
}
else echo "<tr><td>검색어를 입력하세요</td></tr>";

?>
</table>
<br><a href='http://openapi.naver.com/' target='_blank'>네이버 OPENAPI 사용</a>
</center>
</body>
</html>