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解析xml文档的一个简单php类

王朝php·作者佚名  2006-01-10
窄屏简体版  字體: |||超大  

//原创,可以自由使用,欢迎提出改进意见,

<?PHP

//xml中的元素

class XMLTag

{

var $parent;//父节点

var $child;//子节点

var $attribute;//本节点属性

var $data;//本节点数据

var $TagName;//本节点名称

var $depth;//本节点的深度,根节点为1

function XMLTag($tag='')

{

$this->attribute = array();

$this->child = array();

$this->depth = 0;

$this->parent = null;

$this->data = '';

$this->TagName = $tag;

}

function SetTagName($tag)

{

$this->TagName = $tag;

}

function SetParent(&$parent)

{

$this->parent = &$parent;

}

function SetAttribute($name,$value)

{

$this->attribute[$name] = $value;

}

function AppendChild(&$child)

{

$i = count($this->child);

$this->child[$i] = &$child;

}

function SetData($data)

{

$this->data= $data;

}

function GetAttr()

{

return $this->attribute;

}

function GetProperty($name)

{

return $this->attribute[$name];

}

function GetData()

{

return $this->data;

}

function GetParent()

{

return $this->parent;

}

function GetChild()

{

return $this->child;

}

function GetChildByName($name)

{

$total = count($this->child);

for($i=0;$i<$total;$i++)

{

if($this->child[$i]->attribute['name'] == $name)

{

return $this->child[$i];

}

}

return null;

}

//获取某个tag节点

function GetElementsByTagName($tag)

{

$vector = array();

$tree = &$this;

$this->_GetElementByTagName($tree,$tag,$vector);

return $vector;

}

function _GetElementByTagName($tree,$tag,&$vector)

{

if($tree->TagName == $tag) array_push($vector,$tree);

$total = count($tree->child);

for($i = 0; $i < $total;$i++)

$this->_GetElementByTagName($tree->child[$i],$tag,$vector);

}

}

//xml文档解析

class XMLDoc

{

var $parser;//xml解析指针

var $XMLTree;//生成的xml树

var $XMLFile;//将要解析的xml文档

var $XMLData;//将要解析的xml数据

var $error;//错误信息

var $NowTag;//当前指向的节点

var $TreeData;//遍历生成的xml树等到的数据

var $MaxDepth;//本树最大的深度

var $encode;//xml文档的编码方式

var $chs;//字符转换

function XMLDoc()

{

//采用默认的ISO-8859-1

$this->parser = xml_parser_create();

xml_parser_set_option($this->parser,XML_OPTION_CASE_FOLDING,0);

xml_set_object($this->parser,&$this);

xml_set_element_handler($this->parser,'_StartElement','_EndElement');

xml_set_character_data_handler($this->parser,'_CData');

$this->stack = array();

$this->XMLTree = null;

$this->NowTag = null;

$this->MaxDepth = 0;

}

function LoadFromFile($file)

{

$this->XMLFile = fopen($file,'r');

if(!$this->XMLFile)

{

$this->error = '不能打开xml文件';

return false;

}

$this->XMLData = '';

$this->TreeData = '';

return true;

}

function SetXMLData($data)

{

if($this->XMLFile) fclose($this->XMLFile);

$this->XMLData = $data;

$this->TreeData = '';

}

//给树添加一个新的节点

function AppendChild(&$child)

{

if($this->XMLTree == null)

{

$child->depth = 1;

$this->XMLTree = &$child;

$this->NowTag = &$this->XMLTree;

}

else

{

$i = count($this->NowTag->child);

$this->NowTag->child[$i] = &$child;

$child->parent = &$this->NowTag;

$child->depth = $this->NowTag->depth+1;

unset($this->NowTag);

$this->NowTag = &$child;

}

$this->MaxDepth = ($this->MaxDepth < $this->NowTag->depth)?$this->NowTag->depth:$this->MaxDepth;

}

//产生一个新的节点

function &CreateElement($tag)

{

$element = new XMLTag($tag);

return $element;

}

function _StartElement($parser,$element,$attribute)

{

$tag = new XMLTag();

$tag->TagName = $element;

$tag->attribute = $attribute;

if($this->XMLTree == null)

{

$tag->parent = null;

$tag->depth = 1;

$this->XMLTree = &$tag;

$this->NowTag = &$tag;

}

else

{

$i = count($this->NowTag->child);

$this->NowTag->child[$i] = &$tag;

$tag->parent = &$this->NowTag;

$tag->depth = $this->NowTag->depth+1;

unset($this->NowTag);

$this->NowTag = &$tag;

}

$this->MaxDepth = ($this->MaxDepth < $this->NowTag->depth)?$this->NowTag->depth:$this->MaxDepth;

}

function _CData($paraser,$data)

{

$this->NowTag->data = $data;

}

function _EndElement($parser,$element)

{

$parent = &$this->NowTag->parent;

unset($this->NowTag);

$this->NowTag = &$parent;

}

//开始解析xml文档

function parse()

{

if($this->XMLFile)

{

$this->XMLData = '';

while(!feof($this->XMLFile))

{

$this->XMLData .= fread($this->XMLFile,4096);

}

}

fclose($this->XMLFile);

if($this->XMLData)

{

//$this->JudgeEncode();

if (!xml_parse($this->parser, $this->XMLData))

{

$code = xml_get_error_code($this->parser);

$col = xml_get_current_column_number($this->parser);

$line = xml_get_current_line_number($this->parser);

$this->error = "XML error: $col at line $line:".xml_error_string($code);

return false;

}

}

xml_parser_free($this->parser);

return true;

}

//确定编码方式

function JudgeEncode()

{

$start = strpos($this->XMLData,'<?xml');

$end = strpos($this->XMLData,'>');

$str = substr($this->XMLData,$start,$end-$start);

$pos = strpos($str,'encoding');

if($pos !== false)

{

$str = substr($str,$pos);

$pos = strpos($str,'=');

$str = substr($str,$pos+1);

$pos = 0;

while(empty($str[$pos])) $pos++;

$this->encode = '';

while(!empty($str[$pos]) && $str[$pos] != '?')

{

if($str[$pos] != '"' && $str[$pos] != "'")

$this->encode .= $str[$pos];

$pos++;

}

}

$this->chs = new Chinese('UTF-8',$this->encode);

}

//根据节点名称修改某个节点的值

function ChangeValueByName($name,$name,$value)

{

return $this->_ChangeValueByName($this->XMLTree,$name,$value);

}

function _ChangeValueByName($tree,$name,$value)

{

if(is_array($tree->attribute))

{

while (list($k,$v) = each($tree->attribute))

{

if($k = 'name' && $v = $name)

{

$tree->data = $value;

return true;

}

}

}

$total = count($tree->child);

for($i = 0;$i<$total;$i++)

{

$result = $this->_ChangeValueByName($tree->child[$i],$name,$value);

if($result == true) break;

}

return $result;

}

//根据节点名称修改树中某个节点的属性

function ChangeAttrByName($name,$attr,$value)

{

return $this->_ChangeAttrByName($this->XMLTree,$name,$attr,$value);

}

function _ChangeAttrByName(&$tree,$name,$attr,$value)

{

if(is_array($tree->attribute))

{

while(list($k,$v) = each($tree->atttibute))

{

if($k == 'name' && $v == $name)

{

$tree->attribute[$attr] = $value;

return true;

}

}

}

$total = count($tree->child);

for($i = 0;$i<$total;$i++)

{

$result = $this->_ChangeAttrByName($tree->child[$i],$name,$attr,$value);

if($result == true) break;

}

return $result;

}

//获取根节点

function GetDocumentElement()

{

return $this->XMLTree;

}

//遍历生成的xml树,重新生成xml文档

function WalkTree()

{

$this->TreeData = '';

$this->_WalkTree($this->XMLTree);

return $this->TreeData;

}

//递归遍历

function _WalkTree($tree)

{

$this->TreeData .= '<'.$tree->TagName.' ';

if(is_array($tree->attribute))

{

while(list($key,$value) = each($tree->attribute))

{

$this->TreeData .="$key=\"$value\" ";

}

}

$this->TreeData .= '>'.$tree->data;

$total = count($tree->child);

for($i=0;$i<$total;$i++)

{

$this->_WalkTree($tree->child[$i]);

}

$this->TreeData .= '</'.$tree->TagName.">\n";

}

//获取错误信息

function GetError()

{

return $this->error;

}

//获取树的最大深度

function GetMaxDepth()

{

return $this->MaxDepth;

}

//将xml树写入xml文件

function WriteToFile($file,$head='')

{

$fp = fopen($file,'w');

if(!$fp)

{

$this->error = '无法打开写入文件';

return false;

}

if(empty($this->TreeData)) $this->WalkTree();

$head = empty($head)?'<?xml version="1.0" standalone="yes" encoding="gb2312"?>':$head;

fwrite($fp,$head);

fwrite($fp,$this->TreeData);

fclose($fp);

return true;

}

}

?>

 
 
 
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