利用Yahoo! Search API开发自已的搜索引擎-php版
作者：bea
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
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>
"; else echo "<option>$name</option>
";} ?></select></form><?phpfunction done() {?></body></html><?phpexit;}
if(empty($_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 errorsif (!$dom = domxml_open_mem($xml,DOMXML_LOAD_PARSING,$error)) { echo "XML parse error
"; foreach ($error as $errorline) { /* For production use this should obviously be logged to a file instead */ echo $errorline['errormessage']."<br />
"; echo " Node : " . $errorline['nodename'] . "<br />
"; echo " Line : " . $errorline['line'] . "<br />
"; echo " Column : " . $errorline['col'] . "<br />
"; } done();}
// Now traverse the DOM with this function// It is basically a generic parser that turns limited XML into a PHP array// with only a couple of hardcoded tags which are common across all the// result xml from the web servicesfunction xml_to_result($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 $last</p>
";if(!empty($res['ResultSetMapUrl'])) { echo "<p>Result Set Map: <a href="${res[ResultSetMapUrl]}">${res[ResultSetMapUrl]}</a></p>
";}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]}" />
"; break; case 'Cache': echo "Cache: <a href="${value[Url]}">${value[Url]}</a> [${value[Size]}]<br />
"; break; case 'PublishDate': echo "<b>$key:</b> ".strftime('%X %x',$value); break; default: if(stristr($key,'url')) echo "<a href="$value">$value</a><br />
"; else echo "<b>$key:</b> $value<br />"; break; } } echo "<hr />
";}
// Create Previous/Next Page linksif($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.knowsky.com/yahoo/
有用 | 无用
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>
"; else echo "<option>$name</option>
";} ?></select></form><?phpfunction done() {?></body></html><?phpexit;}
if(empty($_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 errorsif (!$dom = domxml_open_mem($xml,DOMXML_LOAD_PARSING,$error)) { echo "XML parse error
"; foreach ($error as $errorline) { /* For production use this should obviously be logged to a file instead */ echo $errorline['errormessage']."<br />
"; echo " Node : " . $errorline['nodename'] . "<br />
"; echo " Line : " . $errorline['line'] . "<br />
"; echo " Column : " . $errorline['col'] . "<br />
"; } done();}
// Now traverse the DOM with this function// It is basically a generic parser that turns limited XML into a PHP array// with only a couple of hardcoded tags which are common across all the// result xml from the web servicesfunction xml_to_result($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 $last</p>
";if(!empty($res['ResultSetMapUrl'])) { echo "<p>Result Set Map: <a href="${res[ResultSetMapUrl]}">${res[ResultSetMapUrl]}</a></p>
";}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]}" />
"; break; case 'Cache': echo "Cache: <a href="${value[Url]}">${value[Url]}</a> [${value[Size]}]<br />
"; break; case 'PublishDate': echo "<b>$key:</b> ".strftime('%X %x',$value); break; default: if(stristr($key,'url')) echo "<a href="$value">$value</a><br />
"; else echo "<b>$key:</b> $value<br />"; break; } } echo "<hr />
";}
// Create Previous/Next Page linksif($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.knowsky.com/yahoo/
有用 | 无用
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