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'';
?>
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data.xml文件:
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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
)
)
)
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2、将数组转换成XML文件:
include('xml.php');//引用PHP XML操作类
$xml= XML_serialize($data);
?>
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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($value),"$tag>n";
elseecho">n",XML_serialize($value,$level+1),str_repeat("t",$level),"$tag>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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