【www.bbyears.com--php函数】
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：
"; print_r($data); echo""; ?>data.xml文件：
利用该XML操作类生成的对应数组（汉字编码：UTF-8）：
Array ( [video] => Array ( [upload] => Array ( [videoid] => 998 [name] => 回忆未来 [memo] => def [up_userid] => 11317 ) ) )2、将数组转换成XML文件：
二、PHP XML操作类源代码：
parse($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; } ?>