PHP中XML操作类XML Library的实现

时间：2022-06-24 20:48:10 编辑：袖梨来源：一聚教程网

本文实例讲述了PHP实现的XML操作类。分享给大家供大家参考，具体如下：

这是一个接口程序，需要大量分析解析XML，PHP的xml_parse_into_struct()函数不能直接生成便于使用的数组，而SimpleXML扩展在PHP5中才支持，于是逛逛搜索引擎，在老外的网站上找到了一个不错的PHP XML操作类。

一、用法举例：

1、将XML文件解释成便于使用的数组：

include('xml.php');//引用PHP XML操作类

$xml=file_get_contents('data.xml');//读取XML文件

//$xml = file_get_contents("php://input"); //读取POST过来的输入流

$data=XML_unserialize($xml);

echo'

';

print_r($data);

echo'';

data.xml文件：

998

11317

利用该XML操作类生成的对应数组（汉字编码：UTF-8）：

Array

(

[video] => Array

(

[upload] => Array

(

[videoid] => 998

[name] => 回忆未来

[memo] => def

[up_userid] => 11317

)

2、将数组转换成XML文件：

include('xml.php');//引用PHP XML操作类

$xml= XML_serialize($data);

二、PHP XML操作类源代码：

###################################################################################

# XML_unserialize: takes raw XMLasa parameter (a string)

#andreturns an equivalent PHP data structure

###################################################################################

function& XML_unserialize(&$xml){

$xml_parser= &newXML();

$data= &$xml_parser->parse($xml);

$xml_parser->destruct();

return$data;

}

###################################################################################

# XML_serialize: serializes any PHP data structure into XML

# Takes one parameter: the data to serialize. Must be anarray.

###################################################################################

function& XML_serialize(&$data,$level= 0,$prior_key= NULL){

if($level== 0){ ob_start();echo'',"n"; }

while(list($key,$value) = each($data))

if(!strpos($key,' attr')) #ifit's not an attribute

#we don't treat attributes by themselves, soforan emptyempty element

# that has attributes you still need to set the element to NULL

if(is_array($value)andarray_key_exists(0,$value)){

XML_serialize($value,$level,$key);

}else{

$tag=$prior_key?$prior_key:$key;

echostr_repeat("t",$level),'<',$tag;

if(array_key_exists("$key attr",$data)){ #ifthere's an attributeforthis element

while(list($attr_name,$attr_value) = each($data["$key attr"]))

echo' ',$attr_name,'="',htmlspecialchars($attr_value),'"';

reset($data["$key attr"]);

}

if(is_null($value))echo" />n";

elseif(!is_array($value))echo'>',htmlspecialchars($value),"n";

elseecho">n",XML_serialize($value,$level+1),str_repeat("t",$level),"n";

}

reset($data);

if($level== 0){$str= &ob_get_contents(); ob_end_clean();return$str; }

}

###################################################################################

# XMLclass: utilityclassto be used with PHP's XML handling functions

###################################################################################

classXML{

var$parser; #a reference to the XML parser

var$document; #the entire XML structure built up so far

var$parent; #a pointer to the current parent - the parent will be anarray

var$stack; #a stack of the most recent parent at each nesting level

var$last_opened_tag; #keeps track of the last tag opened.

functionXML(){

$this->parser = &xml_parser_create();

xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false);

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

xml_set_element_handler(&$this->parser,'open','close');

xml_set_character_data_handler(&$this->parser,'data');

}

functiondestruct(){ xml_parser_free(&$this->parser); }

function& parse(&$data){

$this->document =array();

$this->stack =array();

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

returnxml_parse(&$this->parser, &$data, true) ?$this->document : NULL;

}

functionopen(&$parser,$tag,$attributes){

$this->data =''; #stores temporary cdata

$this->last_opened_tag =$tag;

if(is_array($this->parent)andarray_key_exists($tag,$this->parent)){ #ifyou've seen this tag before

if(is_array($this->parent[$tag])andarray_key_exists(0,$this->parent[$tag])){ #ifthe keys are numeric

#this is the thirdorlater instance of$tagwe've come across

$key= count_numeric_items($this->parent[$tag]);

}else{

#this is the second instance of$tagthat we've seen. shift around

if(array_key_exists("$tag attr",$this->parent)){

$arr=array('0 attr'=>&$this->parent["$tag attr"], &$this->parent[$tag]);

unset($this->parent["$tag attr"]);

}else{

$arr=array(&$this->parent[$tag]);

}

$this->parent[$tag] = &$arr;

$key= 1;

}

$this->parent = &$this->parent[$tag];

}else{

$key=$tag;

}

if($attributes)$this->parent["$key attr"] =$attributes;

$this->parent = &$this->parent[$key];

$this->stack[] = &$this->parent;

}

functiondata(&$parser,$data){

if($this->last_opened_tag != NULL) #you don't need to store whitespace in between tags

$this->data .=$data;

}

functionclose(&$parser,$tag){

if($this->last_opened_tag ==$tag){

$this->parent =$this->data;

$this->last_opened_tag = NULL;

}

array_pop($this->stack);

if($this->stack)$this->parent = &$this->stack[count($this->stack)-1];

}

functioncount_numeric_items(&$array){

returnis_array($array) ?count(array_filter(array_keys($array),'is_numeric')) : 0;

}

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