WEB开发网
开发学院WEB开发PHP 利用Yahoo! Search API开发自已的搜索引擎-php版 阅读

利用Yahoo! Search API开发自已的搜索引擎-php版

 2005-03-07 16:38:42 来源:WEB开发网   
核心提示: 美国东部时间3月1日,雅虎公司联合创始人之一的杨致远将宣布公司的搜索网络将进入Web服务,利用Yahoo! Search API开发自已的搜索引擎-php版,雅虎公司在www.developer.yahoo.com网站建立了Yahoo Search Developer Network,公司计划在此纽约举行的搜索引擎

   美国东部时间3月1日,雅虎公司联合创始人之一的杨致远将宣布公司的搜索网络将进入Web服务。雅虎公司在www.developer.yahoo.com网站建立了Yahoo Search Developer Network,公司计划在此纽约举行的搜索引擎战略大会(Search Engine Strategies Conference)上推出这一计划。该网络将允许开发者在雅虎搜索之上建立新的应用程序,其中包括图像、视频、新闻以及地区搜索等内容。想要使用这项服务的会员必须先去http://api.search.yahoo.com/webservices/register_application  申请一个自已的ID号,注:每个ID号每天只能搜索5000次。

   下面我们看一下,如何用php脚本调用Yahoo! Search API实现搜索的效果,全部脚本如下:
 

<?php
// Yahoo Web Services PHP Example Code
// Rasmus Lerdorf
// www.cncms.com

$appid = 'YahooDemo';
// 在这输入你申请的ID号

$service = array('image'=>'http://api.search.yahoo.com/ImageSearchService/V1/imageSearch',
         'local'=>'http://api.local.yahoo.com/LocalSearchService/V1/localSearch',
         'news'=>'http://api.search.yahoo.com/NewsSearchService/V1/newsSearch',
         'video'=>'http://api.search.yahoo.com/VideoSearchService/V1/videoSearch',
         'web'=>'http://api.search.yahoo.com/WebSearchService/V1/webSearch');
?>
<html>
<head><title>PHP Yahoo Web Service Example Code</title></head>
<body>
<form action="YahooSearchExample.php" method="GET">
Search Term: <input type="text" name="query" /><br />
Zip Code: <input type="text" name="zip" /> (for local search)<br />
<input type="submit" value=" Go! " />
<select name="type">
<?php foreach($service as $name => $val) {
   if(!empty($_REQUEST['type']) && $name == $_REQUEST['type'])
    echo "<option SELECTED>$name</option>\n";
   else echo "<option>$name</option>\n";
} ?>
</select>
</form>
<?php
function done() {?>
</body></html>
<?php
exit;
}

if(empty($_REQUEST['query']) || !in_array($_REQUEST['type'],array_keys($service))) done();

// Ok, here we go, we have the query and the type of search is valid
// First build the query
$q = '?query='.rawurlencode($_REQUEST['query']);
if(!empty($_REQUEST['zip'])) $q.="&zip=".$_REQUEST['zip'];
if(!empty($_REQUEST['start'])) $q.="&start=".$_REQUEST['start'];
$q .= "&appid=$appid";

// Then send it to the apPRopriate service
$xml = file_get_contents($service[$_REQUEST['type']].$q);

// Parse the XML and check it for errors
if (!$dom = domxml_open_mem($xml,DOMXML_LOAD_PARSING,$error)) {
  echo "XML parse error\n";
  foreach ($error as $errorline) {
  /* For production use this should obviously be logged to a file instead */
   echo $errorline['errormessage']."<br />\n";
   echo " Node  : " . $errorline['nodename'] . "<br />\n";
   echo " Line  : " . $errorline['line'] . "<br />\n";
   echo " Column : " . $errorline['col'] . "<br />\n";
  }
  done();
}

// Now traverse the DOM with this function
// It is basically a generic parser that turns limited XML into a PHP array
// with only a couple of hardcoded tags which are common across all the
// result xml from the web services
function xml_to_result($dom) {
  $root = $dom->document_element();
  $res['totalResultsAvailable'] = $root->get_attribute('totalResultsAvailable');
  $res['totalResultsReturned'] = $root->get_attribute('totalResultsReturned');
  $res['firstResultPosition'] = $root->get_attribute('firstResultPosition');

  $node = $root->first_child();
  $i = 0;
  while($node) {
   switch($node->tagname) {
    case 'Result':
     $subnode = $node->first_child();
     while($subnode) {
      $subnodes = $subnode->child_nodes();
      if(!empty($subnodes)) foreach($subnodes as $k=>$n) {
       if(empty($n->tagname)) $res[$i][$subnode->tagname] = trim($n->get_content());
       else $res[$i][$subnode->tagname][$n->tagname]=trim($n->get_content());
      }
      $subnode = $subnode->next_sibling();
     }
     break;
    default:
     $res[$node->tagname] = trim($node->get_content());
     $i--;
     break;
   }
   $i++;
   $node = $node->next_sibling();
  } 
  return $res;
}

$res = xml_to_result($dom);

// Ok, now that we have the results in an easy to use format,
// display them.  It's quite ugly because I am using a single
// display loop to display every type and I don't really understand HTML
$first = $res['firstResultPosition'];
$last = $first + $res['totalResultsReturned']-1;
echo "<p>Matched ${res[totalResultsAvailable]}, showing $first to $last</p>\n";
if(!empty($res['ResultSetMapUrl'])) {
  echo "<p>Result Set Map: <a href=\"${res[ResultSetMapUrl]}\">${res[ResultSetMapUrl]}</a></p>\n";
}
for($i=0; $i<$res['totalResultsReturned']; $i++) {
  foreach($res[$i] as $key=>$value) {
   switch($key) {
    case 'Thumbnail':
     echo "<img src=\"${value[Url]}\" height=\"${value[Height]}\" width=\"${value[Width]}\" />\n";
     break;
    case 'Cache':
     echo "Cache: <a href=\"${value[Url]}\">${value[Url]}</a> [${value[Size]}]<br />\n";
     break;
    case 'PublishDate':
     echo "<b>$key:</b> ".strftime('%X %x',$value);
     break;
    default:
     if(stristr($key,'url')) echo "<a href=\"$value\">$value</a><br />\n";
     else echo "<b>$key:</b> $value<br />";
     break;
   }
  }
  echo "<hr />\n";
}

// Create Previous/Next Page links
if($start > 1)
  echo '<a href="/YahooSearchExample.php'.
            '?query='.rawurlencode($_REQUEST['query']).
             '&zip='.rawurlencode($_REQUEST['zip']).
             '&type='.rawurlencode($_REQUEST['type']).
            '&start='.($start-10).'"><-Previous Page</a>   ';
if($last < $res['totalResultsAvailable'])
  echo '<a href="/YahooSearchExample.php'.
            '?query='.rawurlencode($_REQUEST['query']).
             '&zip='.rawurlencode($_REQUEST['zip']).
             '&type='.rawurlencode($_REQUEST['type']).
            '&start='.($last+1).'">Next Page-></a>';
done();
?>

有兴趣的朋友还可以看一下由[动态网站制作指南]所制作的asp版本:http://www.cncms.com/yahoo/

Tags:利用 Yahoo Search

编辑录入:爽爽 [复制链接] [打 印]
赞助商链接