用PHP&XML编制迷你搜索引擎（四）_PHP

[程序实例 ] 用PHP&XML编制迷你搜索引擎（四） 

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时间   2000年11月30日  阅读次数   247 

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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 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 "

搜索首页　";

echo "后退

".

"

";

echo "

".$title."

";

$i=0;

echo "";

while($icount){

$i+=1;

if(($i%5)==1)echo"";

echo "";

}

echo "

";

echo "".$subs->items[$i]->name."";

echo "

---

";



$i=$page*$pagecount;

if ($webs->count > 0){

echo "".($page+1)."/";

echo Ceil($webs->count/$pagecount);}

echo "";

while($icount&&$i
$i+=1;

echo "";

echo "";

}

echo "

".$i."	". $webs->items[$i]->name."
	".$webs->items[$i]->memo; 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 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 "

搜索首页　";

echo "后退

";

echo "

".$search."

";

$i=0;

echo "";

while($icount){

$i+=1;

if(($i%5)==1)echo"";

echo "";

}

echo "

";

echo "".$subs->items[$i]->name."";

echo "

---

";



$i=$page*$pagecount;

if ($webs->count > 0){

echo "".($page+1)."/";

echo Ceil($webs->count/$pagecount);}

echo "";

while($icount&&$i
$i+=1;

echo "";

echo "";

}

echo "

".$i."	". $webs->items[$i]->name."
	".$webs->items[$i]->memo; echo "

";

if ($webs->count > 0){

if($page>0)echo "上一页　";

if(($page+1)count/$pagecount))echo "下一页";

}

?>

/body>

/html>