// 本人不熟悉XML,可能注解对XML的描述有误
// 这只是个思想,要实现的话应该略加修整,可以把一些不常用条件查询的数据用XML保存
// 如虚拟社区的 用户资料,一般只有用户自己或其他用户指定了他的USERNAME才会显示
// 剩下每次都要开启、查询、解释数据集、关闭数据库的消耗。
define("enter",chr(13).chr(10));
class DATA_XML //关键!!!一个自定义类
{
var $parser; //XML解释器
var $tags; //XML标签
var $on; //
var $root; // 根元素
var $Data = array(); // 元素数组
function DATA_XML($filename,$root) //类初始函数 filename文件名,root根元素
{
$this->root = $root; // 初始根元素
$this->parser = xml_parser_create();//创建解释对象
xml_set_object(&$this->parser,&$this);//设置对象
xml_set_element_handler($this->parser,"tag_on","tag_off");//设置元素管理函数
xml_set_character_data_handler($this->parser,"getdata"); //设置数据管理事件
xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, 0); //要求严格区分大小写
if( file_exists($filename) ) //找到文件吗?
{//找到
$fp = fopen($filename,"r"); // 只读打开
$c = fread($fp,filesize($filename)); //读取数据
fclose($fp);//关闭
$this->parse($c); //设置解释对象
}
else
{
echo "ooooo"; //!?!好象是调试时用的,去掉 else好了
}
}
function parse($data)//解释函数
{
xml_parse($this->parser,$data);
}
function tag_on($parser,$tag,$attributes)//发现元素触发函数
{
$this->on = true; // 已经触发过
$this->tags = $tag;
//echo $tag;
}
function tag_off($parser,$tag) //元素结素函数
{
$this->on = false; // 元素结素
}
function getdata($parser,$cdata) //取出元素
{
if($this->on && $this->tags!=$this->root)
{//验证一下比较好,(现在是否为元素的开始,并且不是根元素?)
$this->Data[$this->tags]=trim($cdata);
// 关键啊!!用标签做数组表,并给这个数组元素付上数据
//echo trim($cdata);
//echo $this->tags;
//echo "\n";
}
}
function check($str)
{//检查字符
if( strlen($str)return ' ';//返回 ' '
else
return $str;//否则原路返回(不然XML好象会不做结束标记)
}
function saveas($filename)//另存为
{
$c=''.enter;
//这个不用说了吧,enter是define("enter",chr(13).chr(10));
$c.="root.">".enter;
//首先设定一下根元素
for( reset($this->Data);$i=key($this->Data);next($this->Data))
{//开始举出所有数据啦
$c.= "".$this->check($this->Data[$i])."".$i.">".enter;
// 用数组表名做元素标签,并加上数据内容
}
//echo $c;
$c.="".$this->root.">".enter;//结束标签
$fp = fopen( $filename , "w" );//写入文件
fwrite($fp,$c);
fclose($fp);
}
};
/*新键一个XML文件
$xml = new DATA_XML(路径."arm.xml","DATA"/*根元素*/);
$xml->Data["UserName"]="关羽";
$xml->Data["Nick"]="关云长";
$xml->saveas( 路径."arm.xml");
unset( $xml );
// 读取一个文件
$xml = new DATA_XML(路径."arm.xml","DATA");
echo $xml->Data["Nick"];//显示一下?
$xml->Data["Nick"]="关老爷";//UPDATE
$xml->Data["Master"]="刘备";//INSERT INTO
$xml->saveas(路径."arm.xml");//另存为覆盖本身
*/
?>

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