php 接收与发送xml文件

 <?php
/*Khalid XML files parser :: class kxparse, Started in March 2002 by Khalid Al-kary*/
class kxparse{
var $xml;
var $cursor;
var $cursor2;

//the constructor $xmlfile is the file you want to load into the parser
function kxparse($xmlfile)
{
 //just read the file
 $file=fopen($xmlfile,"r");
 
 //put the text inside the file in the XML object variable
 while (!feof($file))
  {
   $this->xml.=fread($file,4096);  
  }
 
 //close the opened file
 fclose($file);

 //set the cursor to 0 (start of document), the cursor is later used by another functions
 $this->cursor=0;

 //set the second curosr to the end of document
 $this->cursor2=strlen($this->xml);
}

/*this function first gets a copy of the XML file starting from cursor and ending with cursor2
and then counts the number of occurences of the given tag name inside that area
returns an array (occurrence index -> occurence position in the XML file)
this function is half of the engine that moves Kxparse */
function track_tag_cursors($tname)
 {
  //getting the copy as intended
  $currxml=substr($this->xml,$this->cursor,$this->cursor2);
  
  //counting the number of occurences in the cut area
  $occurs=substr_count($currxml,"<".$tname);
  
  //the aray that will be returned
  $tag_poses=array();
  
  //setting its 0 to 0 because indeces in Kxparse start from 1
  $tag_poses[0]=0;
  
  //for each of the occurences
  for ($i=1;$i<=$occurs;$i++)
   {
    
    if ($i!=1)
     {
      //if it's not the first occurence
      //start checking for the next occurence but first cut the previous occurences off from the string
      $tag_poses[$i]=strpos($currxml,"<".$tname,$tag_poses[$i-1]+1-$this->cursor)+$this->cursor;
     }
    else
     {
      //if its the first occurence just assign its value + the cursor (because the position is in the XML file wholly
      $tag_poses[$i]=strpos($currxml,"<".$tname)+$this->cursor;
     }
     
   }
  
  //return that array 
  return $tag_poses;
 }
//this function strips and decodes the tag text...
function get_tag_text_internal($tname)
 {
  //strip the tags from the returned text and the decode it
  return $this->htmldecode(strip_tags($tname));
 }

//function that returns a particular attribute value ...
//tag is the tag itself(with its start and end)
function get_attribute_internal($tag,$attr)
 {
  //identifying the character directly after the tag name to cut it then
  if (strpos($tag," ")<strpos($tag,">"))
   {
    $separ=" ";
   }
  else
   {
    $separ=">";
   }

  //cutting of the tag name according to separ
  $tname=substr($tag,1,strpos($tag,$separ)-1);

  //cut the tag starting from the white space after the tag name, ending with(not containing) the > of the tag start
  $work=substr($tag,strlen($tname)+1,strpos($tag,">")-strlen($tname)-1);

  //get the index of the tag occurence inside $work
  $index_of_attr=strpos($work," ".$attr."="")+1;

  //check if the attribute was found in the tag
  if ($index_of_attr)
   {
    //now get the attributename+"=""+attrbutevalue+""" and extract the value from between them
    //calculate from where we will cut
    $index_of_value=$index_of_attr+strlen($attr)+2;

    //cut note the last argument for calculating the end
    $work=substr($work,$index_of_value,strpos($work,""",$index_of_value)-$index_of_value);

    //now return the attribute value
    return $work;
   }

   //if the attribute wasn't found, return false'
  else
   {
    return FALSE;
   }
 }

//this function HTML-decodes the var $text...
function htmldecode($text)
 {
  $text=str_replace("&lt;","<",$text);
  $text=str_replace("&gt;",">",$text);
  $text=str_replace("&amp;","&",$text);
  $text=str_replace("&ltt;","&lt;",$text);
  $text=str_replace("&gtt;","&gt;",$text);
  return $text;
 }

//the function that saves a file to a particular location
function save($file)
 {
  //open the file and overwrite of already avilable
  $my_file=fopen($file,"wb");

  //$my_status holds wether the operation is okay
  $my_status=fwrite($my_file,$this->xml);

  //close the file handle
  fclose($my_file);

  if ($my_status!=-1)
   {
    return TRUE;
   }
  else
   {
    return FALSE;
   }

 }

//function that gets a tag in the XML tree (with its starting and ending)
function get_tag_in_tree($tname,$tindex)
 {
  $this->get_work_space($tname,$tindex);
  return substr($this->xml,$this->cursor,$this->cursor2-$this->cursor);
 }
//function that gets the text of a tag
function get_tag_text($tname,$tindex)
{
 $mytag=$this->get_tag_in_tree($tname,$tindex);
 return $this->get_tag_text_internal($mytag);
} 
//funtion that counts the number of occurences of a tag in the XML tree 
function count_tag($tname,$tindex)
 {
  return $this->get_work_space($tname,$tindex);
 }
 
//functoin that gets the attribute value in a tag 
function get_attribute($tname,$tindex,$attrname) 
 {
  $mytag=$this->get_tag_in_tree($tname,$tindex);
  return $this->get_attribute_internal($mytag,$attrname);
 }

//Very important function, half of the engine
//sets the $this->cursor and $this->cursor2 to the place where it's intended to work 
function get_work_space($tname,$tindex) 
 {
  //counts the number of ":"  in the given colonedtagindex
  $num_of_search=substr_count($tindex,":");
  
  //counts the number of ":" in the given colonedtagname
  $num_of_search_text=substr_count($tname,":");
  
  //checks if they are not equal this regarded an error
  if ($num_of_search!=$num_of_search_text)
   {
    return false;
   }
  else
   {
    //now get the numbers in an array
    $search_array=explode(":",$tindex);
    
    //and also get the corresponding tag names
    $search_text_array=explode(":",$tname);
    
    //set the cursor to 0 in order to erase former work
    $this->cursor=0;
    
    //set the cursor2 to the end of the file for the same reason
    $this->cursor2=strlen($this->xml);
    
    //get the first tag name to intiate the loop
    $currtname=$search_text_array[0];
    
    //get the first tag index to intiate the loop
    $currtindex=$search_array[0];
    
    //the loop according to number of ":"
    for ($i=0;$i<count($search_array);$i++)
     {
      //if it's not the first tag name and index
      if ($i!=0)
       {
        //so append the latest colonedtagname to the current tag name
        $currtname=$currtname.":".$search_text_array[$i];
        
        //and append the latset colonedtagindex to the current tag index
        $currtindex=$currtindex.":".$search_array[$i];
       }
      //$arr holds the number of occurences of the current tag name between the cursor and cursor2 
      $arr=$this->track_tag_cursors($search_text_array[$i]);
      
      //the index which you want to get the position of
      $tem=$search_array[$i];
      
      //to support count_tag_in_tree
      //when given a ? it returns the number of occurences of the current tag name
      if ($tem=="?")
       {
        return count($arr)-1;
       }
      else { 
      
      //to support the auto-last method
      //if the current tag index equals "-1" so replace it by the last occurence index
      if ($tem==-1) 
       {
        $tem=count($arr)-1;
       }
      
      //now just set cursor one to the occurence position in the XML file accrding to $tem 
      $this->cursor=$arr[(int)$tem];
      
      //and set cursor2 at the end of that tag
      $this->cursor2=strpos($this->xml,"</".$search_text_array[$i].">",$this->cursor)+strlen("</".$search_text_array[$i].">");
       }
     }
   } 
}
//the function that appends a tag to the XML tree
function create_tag($tname,$tindex,$ntname) 
 {
  //first get the intended father tag
  $this->get_work_space($tname,$tindex);
  
  //explode the given colonedtagname into an array
  $search_text_array=explode(":",$tname);
  
  //after setting the cursors using get_work_space
  //get a cope of the returned tag
  $workarea=substr($this->xml,$this->cursor,$this->cursor2-$this->cursor);
  
  //calculate the place where you will put the tag start and end
  $inde=$this->cursor+strpos($workarea,"</".$search_text_array[count($search_text_array)-1].">");
  
  //here, replace means insert because the length argument is set to 0
  $this->xml=substr_replace($this->xml,"<".$ntname."></".$ntname.">",$inde,0);
 }
//the function that sets the value of an attribute 
function set_attribute($tname,$tindex,$attr,$value)
 {
  //first set the cursors using get_work_space
  $this->get_work_space($tname,$tindex);
  
  //now get a copy of the XML tag between cursor and cursor2
  $currxml=substr($this->xml,$this->cursor,$this->cursor2-$this->cursor);
  
  //cut the area of the tag on which you want to work
  //starting from the tag "<" and ending with the opening tag ">"
  $work=substr($currxml,0,strpos($currxml,">")+1);
  
  //if the attribute is already available
  if (strpos($work," ".$attr."=""))
  {
   //calculate the current value's length
   $currval_length=strlen($this->get_attribute_internal($currxml,$attr));
   
   //get the position of the attribute inside the tag
   $my_attribute_pos=strpos($work," ".$attr."="")+1;
   
   //get the length of the attribute
   $my_attribute_length=strlen($attr);
   
   //now replace the old value
   $this->xml=substr_replace($this->xml,$value,$this->cursor+$my_attribute_pos+$my_attribute_length+2,$currval_length);
   return TRUE;
  }
  
  //if the attribute wasn't already available'
  else
  {
   //check if there are other attributes in the tag
   if (strpos($work," "))
    {
     $separ=" ";
    }
   else
    {
     $separ=">";
    }
   
   //prepare the attribute
   $newattr=" ".$attr."="".$value.""";
   
   //insert the new attribute
   $this->xml=substr_replace($this->xml,$newattr,$this->cursor+strpos($work,$separ),0);
   return TRUE;
  } 
}
//the function that changes or adds the text of a tag
function set_tag_text($tname,$tindex,$text)
 {
  //firs get set the cursors using get_work_space
  $this->get_work_space($tname,$tindex);
  
  //explode the given colonedtagname in an array
  $search_text_array=explode(":",$tname);
  
  //get the latest name
  $currtname=$search_text_array[count($search_text_array)-1];
  
  //calculate the start of replacement
  $replace_start_index=strpos($this->xml,">",$this->cursor)+1;
  
  //calculate the end of replacement
  $replace_end_index=strpos($this->xml,"</".$currtname.">",$this->cursor)-1;
  
  //calculate the length between them
  $tem=$replace_end_index-$replace_start_index+1;
  
  //and now replace
  $this->xml=substr_replace($this->xml,$text,$replace_start_index,$tem);
 }
//functio that removes a tag 
function remove_tag($tname,$tindex) 
 {
  //set the cursors using get_work_space
  $this->get_work_space($tname,$tindex);
  
  //now replace with ""
  $this->xml=substr_replace($this->xml,"",$this->cursor,$this->cursor2-$this->cursor);
 }

}
?>                                                                                                                              testing.xml                                                                                         0100400 0177776 0177776 00000001125 07561460576 013104  0                                                                                                    ustar   nobody                          nogroup                                                                                                                                                                                                                <?xml version="1.0"?>
<tryingxml testattribute="we are here">
<firstlevel testingattribute="no we aren't here">
sometext for the first level
<secondlevel testingattribute="We are there">
some text for the second level
<thirdlevel testingattribute="we aren't there">
some text for the third level
</thirdlevel>
<thirdlevel testingattribute="we are every where :)">
this is a test of multiple children per parent node
<justachild testingattribute="a value ofcourse">is it okay with you now ? go check the script</justachild>
</thirdlevel>
</secondlevel>
</firstlevel>
</tryingxml>
                                                                                                                                                                                                                                                                                                                                                                                                                                           nav.php                                                                                             0100400 0177776 0177776 00000000543 07561460576 012205  0                                                                                                    ustar   nobody                          nogroup                                                                                                                                                                                                                <?php
//including khalid xml parser
include_once "kxparse.php";

//create the object
$xmlnav=new kxparse("nav.xml");

for ($i=1;$i<=$xmlnav->count_tag("nav:item","1:?");$i++)
{?>
<div class="navit"><a href="<?php echo $xmlnav->get_attribute("nav:item","1:".$i,"href") ?>"><?php echo $xmlnav->get_tag_text("nav:item","1:".$i) ?></a></div>
<?}?>
                                                                                                                                                             nav.xml                                                                                             0100400 0177776 0177776 00000000507 07561460576 012216  0                                                                                                    ustar   nobody                          nogroup                                                                                                                                                                                                                <?xml version="1.0"?>
<nav>
<item href="http://111cn.net/kxparse/index.php">Home</item>
<item href="http://111cn.net/kxparse/news.php">News</item>
<item href="http://111cn.net/kxparse/docs.php">Documentation</item>
<item href="http://111cn.net/kxparse/changelog.php">Change Log</item>
</nav>

function xml_file($filename, $keyid = 'errorentry')
{
   $string = implode('', file($filename));
   return xml_str($string, $keyid);
}

function xml_str($string, $keyid = 'errorentry')
{
 $parser = xml_parser_create();
 xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
 xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
 xml_parse_into_struct($parser, $string, $values, $tags);
 xml_parser_free($parser);
 $tdb = array();
 foreach ($tags as $key=>$val)
 {
  if($key != $keyid) continue;
  $molranges = $val;
  for ($i=0; $i < count($molranges); $i+=2)
  {
     $offset = $molranges[$i] + 1;
     $len = $molranges[$i + 1] - $offset;
     $tdb[] = xml_arr(array_slice($values, $offset, $len));
  }
 }
 return $tdb;
}

function xml_arr($mvalues)
{
 $arr = array();
 for($i=0; $i < count($mvalues); $i++)
 {
    $arr[$mvalues[$i]['tag']] = $mvalues[$i]['value'];
 }
 return $arr;
}

<?php
    require_once("Inc/Conn.php");//系统配置文件
 $sql = "select *  from ose";
 $result = mysql_query($sql) ;
 $total = mysql_num_rows($result);
 if( $total )
 {
  $pagesize =4;
  $pagecount=($total % $pagesize)?(int)($total / $pagesize)+1:$total/$pagesize;//统计总页面
  $page  =isset($_GET['page'])?$_GET['page']:1;//取得当前页面
  $start =($page>=1 && $page<=$pagecount)?$start=$pagesize*($page-1):$start=1;//取得超始记录
  $sql.="  order by id desc limit $start,$pagesize" ;  
  $result = mysql_query( $sql );
  while( $rs = mysql_fetch_array($result) )
  {   
   $temp .= "<member id="".$rs['id']."" roomname="".$rs['User_Name'].""/>n";   
  }
 }
 else
 {
  die('{result:"false"}');
 }
 //die('bb');
 echo "<?xml version="1.0" encoding="gb2312" ?>n<root>n<page now="$page" count="$pagecount"/>n<roomlist>n",$temp,"</roomlist>n</root>";
 
?>

输出结果为：

<html>
<head>
<title>Ajax应用</title>
<script language="JavaScript" type="text/javascript" src="ajax.js"></script>
<style type="text/css">
<!--CSS样式表用于定义页面的显示外观，将内容和显示分离
#answershow{ border:#E2FAFA; color:#000099; font-size:12px;}
#main{visibility:hidden;}
#begin{
    visibility:visible;
 position:absolute;
 left:135px;
 top:103px;
 width:37px;
 height:16px;
 z-index:1;
}
-->
</style>
</head>
<body>
<div id="begin"><input type="button" id="startq" value="开始"></div>
<h1>简单测试系统</h1><p><b>问题:</b> <span id="question">欢迎使用本考试系统，请单击开始！</span></p>
<div id="main">
<p><b>答案:</b><input type="text" id="answer">
<input type="button" value="Submit" id="submit">
<br><b> 提示：</b><span id="answershow"></span>
</div>
<script language="JavaScript" type="text/javascript" src="manage.js"></script>
</body>
</html>

ajax.js文件

var ajaxreq=false, ajaxCallback;
function ajaxRequest(filename) {
   try {
    ajaxreq= new XMLHttpRequest();
   } catch (error) {
    try {
      ajaxreq = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (error) {
      return false;
    }
   }
   ajaxreq.open("GET",filename);
   ajaxreq.onreadystatechange = ajaxResponse;
   ajaxreq.send(null);
}
function ajaxResponse() {
   if (ajaxreq.readyState !=4) return;
   if (ajaxreq.status==200) {
      if (ajaxCallback) ajaxCallback();
   } else alert("Request failed: " + ajaxreq.statusText);
   return true;
}
是很简单的创建xmlhttp哦，更实用健全的xmlhttp创建方法最好的xmlhttp创建方法

mange.js 文件，

var qn=0,questions,right=0;
function getQuestions() {    //getElementById用于定位到要操作的页面元素
   document.getElementById("main").style.visibility="visible";
   document.getElementById("begin").style.visibility="hidden";
   document.getElementById("answer").focus();
   obj=document.getElementById("question");
   obj.firstChild.nodeValue="正在加载.....";
   ajaxCallback = nextQuestion;
   ajaxRequest("questions.xml");     //从服务器端XML文本加载问题
}
function nextQuestion() {        //显示下一个问题
   questions = ajaxreq.responseXML.getElementsByTagName("ask");
   obj=document.getElementById("question");
   if (qn < questions.length) {
      q = questions[qn].firstChild.nodeValue;
      obj.firstChild.nodeValue=q;
   } else {           //用户回答完使用题时，给予评分
   var anobj=document.getElementById("answershow");     
   anobj.innerHTML="您的分数为："+right/questions.length*100;
   }
}
function checkAnswer() {       //即时检查用户作答情况
   answers = ajaxreq.responseXML.getElementsByTagName("key");
   a = answers[qn].firstChild.nodeValue;
   answerfield = document.getElementById("answer");
   if(answerfield.value==""){ var anobj=document.getElementById("answershow");//用户没有作答时提示
  var anobj=document.getElementById("answershow");
     anobj.innerHTML="对不起，你还没有回答";
  answerfield.focus();
     return;}
   else if (a.toLowerCase() == (answerfield.value).toLowerCase()) {  //用户答对时的提示
    right++;
    var anobj=document.getElementById("answershow");
     anobj.innerHTML="回答正确!";
   answerfield.focus();
   }
   else {
       var anobj=document.getElementById("answershow");  //用户打错时的提示
      anobj.innerHTML="答案错误,答案应为:"+a;
      answerfield.focus();
    }
   qn = qn + 1;
   answerfield.value="";
   nextQuestion();
}
//下面几行为按钮创建事件处理
obj=document.getElementById("startq");
obj.onclick=getQuestions;
ans=document.getElementById("submit");
ans.onclick=checkAnswer;
这个文件是分析节点，判断答案是否正确的。

questions.php

<?php
 $link=mysql_connect("localhost","root","");
 mysql_select_db("quiz",$link);
 mysql_query("set names gb2312");
 $sql=mysql_query("select * from questions");
 echo "<?xml version='1.0' encoding='gb2312'?><questions>";
 
 while($info=mysql_fetch_array($sql)){
  echo "<ask>".$info[question]."</ask><key>".$info[answer]."</key>";
  };
 echo "</questions>";
?>

questions.xml

<?xml version="1.0" encoding="gb2312" ?>
<questions>
  <ask>传统的web开发模式与Ajax开发模式相比，哪个效率更高？</ask>
  <key>Ajax</key>
  <ask>Ajax技术的核心对象是什么？</ask>
  <key>XMLHttpResponse</key>
  <ask>Ajax技术中使用什么方法来定位你需要操作的元素？</ask>
  <key>getElementById</key>
  <ask>Ajax用来定义显示的是什么技术？</ask>
  <key>CSS</key>
   <ask>服务端对浏览端的响应存储在XMLHttpResponse的哪个属性中(作为xml文档)？</ask>
  <key>responseXML</key>
</questions>

就这么简单哦，下面来看看这款吧。