[程序实例]用PHP&XML编制迷你搜索引擎（四）
作者 来源时间 2000年11月30日 阅读次数 247版本-----价值 17[投他一票]来源：奥索网用PHP&XML编制迷你搜索引擎（四）
五、mini的搜索引擎作了如干的铺垫
，令人激动的时刻到来了。分页等版式输出和用SQL的搜索引擎差不多，我就不加注释了。第一段为仿sina，yahoo的按照类别查询第二段为搜索查询部分(其实就是把整个树遍历一遍)显示符合的内容。说明："网络狂飙之谜你搜索引擎"适用于小数据量的数据索引查询，根据测试，当数据量超过1000条以后便不再适用，相当浪费主机资源，建议您超过400条记录采用mysql等数据库语言构建。希望您通过我的程序，对PHP对XML的解析函数有所认识。所有范例程序欢迎大家适用，如果您要将其用于自己的主页中请于我联系说明（其实就是将其用于的网站的名称告知于我）
。sfs (sfsz@chinese.
com)以上的所有范例请到我的主页fire.
oso.
com.
cn上下载，我学PHP不到一个月，也刚来oso，希望文章中的错误之处大家能谅解。以后，我将为大家奉献出更多的源创范例。废话少说，尽请看来。__________________________________________________________xml2.
php html>body>style type=text/css>td,p,li,input,select{font-size:12px;}A:link{font-size:12px;color:#00007f;}A:visited{font-size:12px;color:#00007f;}A:active{font-size:12px;color:#ff0000;}A:hover{font-size:12px;color:#ff0000;}.title{font-family:Tahoma;width=420;font-size:16px;font-weight:bold;color:steelblue;filter:Shadow(color="LightGrey",Direction="130");}.counter{font-family:Tahoma;color=green;font-size:12px;}/style>// XML文件$file = "demo.xml";$pagecount = 10;class Cweb { //网页var $name;var $url;var $memo;}class Cwebs {var $items = array(Cweb);var $count = 0;}class Csub { //类别var $name;var $url;}class Csubs {var $items = array(Csub);var $count = 0;}function xml_parse_from_file($parser, $file){if(!file_exists($file))die("Can’t find file "$file".");if(!($fp = @fopen($file, "r")))die("Can’t open file "$file".");while($data = fread($fp, 4096)) {if(!xml_parse($parser, $data, feof($fp)))return(false);}fclose($fp);return(true);}function start_element($parser, $name, $attrs){global $show,$level,$levelcount,$maxlevel,$hide,$lev,$num,$PHP_SELF;global $webs,$subs;$level += 1;if($level>$maxlevel)$maxlevel=$level;$levelcount[$level]+=1;if($hide){if($level==$lev&&$levelcount[$level]==$num)$hide=FALSE;}else{if($level}if(!$hide){switch($name){case "sub":$show="sub";break;case "web":$show="web";break;default:break;}if($level==$lev+1&&$level>0){switch($show){case "sub":$subs->count+=1;$subs->items[$subs->count]->url = "$PHP_SELF?lev=$level&num=$levelcount[$level]";break;case "web":$webs->count+=1;while ( list( $key, $val ) = each( $attrs ) ) {switch(trim($key)){case "url" :$webs->items[$webs->count]->url=trim($val);break;case "memo" :$webs->items[$webs->count]->memo=trim($val);break;}}break;default:break;}}}}function stop_element($parser, $name){global $level;$level -= 1;}function data($parser, $data){global $level,$hide,$show,$lev,$levelcount,$num;global $webs,$subs,$title;if($level==$lev&&$levelcount[$level]==$num&&trim($data)!="")$title=trim($data);if(!$hide)if(trim($data)!=""&&($level==$lev+1&&$level>0)){switch($show){case "sub":$subs->items[$subs->count]->name=trim($data);break;case "web":$webs->items[$webs->count]->name=trim($data);break;}}}//main startglobal $lev,$num,$PHP_SELF;global $title,$webs,$subs;$level = -1;$hide = TRUE;$webs = new Cwebs;$subs = new Csubs;if($lev==""){$lev=0;$num=1;}if($page=="")$page=0;$parser = xml_parser_create();xml_set_element_handler($parser, "start_element", "stop_element");xml_set_character_data_handler($parser, "data");xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);$ret = xml_parse_from_file($parser, $file);if(!$ret){die(sprintf("XML error: %s at line %d",xml_error_string(xml_get_error_code($parser)),xml_get_current_line_number($parser)));}xml_parser_free($parser);echo "搜索首页";echo "后退"."";echo "".$title."";$i=0;echo "";while($icount){$i+=1;if(($i%5)==1)echo"";echo "";echo "".$subs->items[$i]->name."";echo "";}echo "";$i=$page*$pagecount;if ($webs->count > 0){echo "".($page+1)."/";echo Ceil($webs->count/$pagecount);}echo "";while($icount&&$i$i+=1;echo "";echo "".$i."".$webs->items[$i]->name."".$webs->items[$i]->memo;echo "";}echo "";if ($webs->count > 0){if($page>0)echo "上一页";if(($page+1)count/$pagecount))echo "下一页";}?>/body>/html>__________________________________________________________xml3.php关键字匹配采用eregi函数，功能相对简单，且有些bug，如输入C++会报错（因为+是关键字）这点就不如用SQL查询了。您可以在下面的程序的基础上加以完善，我这个迷你的就起到抛砖引玉的作用吧。html>body>style type=text/css>td,p,li,input,select{font-size:12px;}A:link{font-size:12px;color:#00007f;}A:visited{font-size:12px;color:#00007f;}A:active{font-size:12px;color:#ff0000;}A:hover{font-size:12px;color:#ff0000;}.title{font-family:Tahoma;width=420;font-size:16px;font-weight:bold;color:steelblue;filter:Shadow(color="LightGrey",Direction="130");}.counter{font-family:Tahoma;color=green;font-size:12px;}/style>// XML文件$file = "demo.xml";$pagecount = 10;class Cweb { //网页var $name;var $url;var $memo;}class Cwebs {var $items = array(Cweb);var $count = 0;}class Csub { //类别var $name;var $url;}class Csubs {var $items = array(Csub);var $count = 0;}// 解析XML文件的函数function xml_parse_from_file($parser, $file){if(!file_exists($file))die("Can’t find file "$file".");if(!($fp = @fopen($file, "r")))die("Can’t open file "$file".");while($data = fread($fp, 4096)) {if(!xml_parse($parser, $data, feof($fp)))return(false);}fclose($fp);return(true);}function start_element($parser, $name, $attrs){global $show,$level,$levelcount,$maxlevel,$PHP_SELF;global $webs,$subs;global $search,$finded;$finded=FALSE;$level += 1;if($level>$maxlevel)$maxlevel=$level;$levelcount[$level]+=1;switch($name){case "sub":$show="sub";break;case "web":$show="web";break;default:break;}switch($show){case "sub":$subs->count+=1;$subs->items[$subs->count]->url = "xml2.php?lev=$level&num=$levelcount[$level]";break;case "web":$webs->count+=1;while ( list( $key, $val ) = each( $attrs ) ) {if(eregi($search,$val))$finded=TRUE;switch(trim($key)){case "url" :$webs->items[$webs->count]->url=trim($val);break;case "memo" :$webs->items[$webs->count]->memo=trim($val);break;}}break;default:break;}}function stop_element($parser, $name){global $level;$level -= 1;}function data($parser, $data){global $level,$show,$levelcount;global $webs,$subs;global $search,$finded;if(trim($data)!=""){switch($show){case "sub":$subs->items[$subs->count]->name=trim($data);if(!eregi($search,$data))$subs->count-=1;break;case "web":$webs->items[$webs->count]->name=trim($data);if((!eregi($search,$data))&&(!$finded))$webs->count-=1;break;}}}//main startglobal $PHP_SELF;global $search,$webs,$subs;$level = -1;$hide = TRUE;$webs = new Cwebs;$subs = new Csubs;if($page=="")$page=0;if($search=="")$search="请输入关键字";$parser = xml_parser_create();xml_set_element_handler($parser, "start_element", "stop_element");xml_set_character_data_handler($parser, "data");xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);$ret = xml_parse_from_file($parser, $file);if(!$ret){die(sprintf("XML error: %s at line %d",xml_error_string(xml_get_error_code($parser)),xml_get_current_line_number($parser)));}xml_parser_free($parser);// 输出echo "搜索首页";echo "后退仿搜索引擎文本框自动补全插件仿搜索引擎文本框自动补全插件下载";echo "".$search."";$i=0;echo "";while($icount){$i+=1;if(($i%5)==1)echo"";echo "";echo "".$subs->items[$i]->name."";echo "";}echo "";$i=$page*$pagecount;if ($webs->count > 0){echo "".($page+1)."/";echo Ceil($webs->count/$pagecount);}echo "";while($icount&&$i$i+=1;echo "";echo "".$i."".$webs->items[$i]->name."".$webs->items[$i]->memo;echo "";}echo "";if ($webs->count > 0){if($page>0)echo "上一页";if(($page+1)count/$pagecount))echo "下一页";}?>/body>/html>