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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。
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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<=$lev)$hide=TRUE;
}
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 start
global $lev,$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($parser);
echo "<p><a href=$PHP_SELF>搜索首页</a> ";
echo "<a href="javascript:history.back()">后退</a><form action="xml3.php" method="get">".
"<input name="search" type=edit><input type=submit value="Search"></form></p>";
echo "<center><div class=title>".$title."</div></center>";
$i=0;
echo "<table width="740">";
while($i<$subs->count){
$i+=1;
if(($i%5)==1)echo"<tr>";
echo "<td width = 20%>";
echo "<a href=".$subs->items[$i]->url.">".$subs->items[$i]->name."</a>";
echo "</td>";
}
echo "</table><hr>";
$i=$page*$pagecount;
if ($webs->count > 0){
echo "<center>".($page+1)."/";
echo Ceil($webs->count/$pagecount);}
echo "<table width=740>";
while($i<$webs->count&&$i<(($page+1)*$pagecount)){
$i+=1;
echo "<tr>";
echo "<td width=40>".$i."<td width=700><a href=".$webs->items[$i]->url.">".
$webs->items[$i]->name."</tr><tr><td/><td>".$webs->items[$i]->memo;
echo "</td></tr>";
}
echo "</table>";
if ($webs->count > 0){
if($page>0)echo "<a href="."$PHP_SELF?lev=$lev&num=$num&page=".($page-1).">上一页</a> ";
if(($page+1)<Ceil($webs->count/$pagecount))echo "<a href="."$PHP_SELF?lev=$lev&num=$num&page=".($page+1).">下一页</a>";
}
?>
</body>
</html>
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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 start
global $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($parser);
// 输出
echo "<p><a href=xml2.php>搜索首页</a> ";
echo "<a href="javascript:history.back()">后退</a></p>";
echo "<center><div class=title>".$search."</div></center>";
$i=0;
echo "<table width="740">";
while($i<$subs->count){
$i+=1;
if(($i%5)==1)echo"<tr>";
echo "<td width = 20%>";
echo "<a href=".$subs->items[$i]->url.">".$subs->items[$i]->name."</a>";
echo "</td>";
}
echo "</table><hr>";
$i=$page*$pagecount;
if ($webs->count > 0){
echo "<center>".($page+1)."/";
echo Ceil($webs->count/$pagecount);}
echo "<table width=740>";
while($i<$webs->count&&$i<(($page+1)*$pagecount)){
$i+=1;
echo "<tr>";
echo "<td width=40>".$i."<td width=700><a href=".$webs->items[$i]->url.">".
$webs->items[$i]->name."</tr><tr><td/><td>".$webs->items[$i]->memo;
echo "</td></tr>";
}
echo "</table>";
if ($webs->count > 0){
if($page>0)echo "<a href="."$PHP_SELF?search=$search&page=".($page-1).">上一页</a> ";
if(($page+1)<Ceil($webs->count/$pagecount))echo "<a href="."$PHP_SELF?search=$search&page=".($page+1).">下一页</a>";
}
?>
</body>
</html>
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