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.knowsky.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();
- ?>
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