这个东东搞了我一天。。。可是到最后发现却无法实现自己想像中的那种效果。。。真是可惜。。。看来PHP对XML还需要加强。。。如果哪位对此有研究。欢迎来信探讨。。。

首先建表：
CREATE TABLE books (
   bookid int(4) NOT NULL auto_increment,
   bookname varchar(100) NOT NULL,
   bookauth varchar(50) NOT NULL,
   bookpublisher varchar(50) NOT NULL,
   bookpubdate datetime NOT NULL,
   bookurl varchar(50) NOT NULL,
   KEY bookid (bookid),
);

然后。。。这段是从MYSQL里取数据转化成XML的源代码：
<?
$connect_id=mysql_connect("localhost","root","");
mysql_select_db("bbs",$connect_id);
$query="select * from books order by bookid";
$rs=mysql_query($query,$connect_id);
$numfields=mysql_num_fields($rs);
$xmlfile="<?xml version=\"1.0\" encoding=\"GB2312\"?>\n";
$xmlfile.="<books>\n";

while($row=mysql_fetch_array($rs)){
    for($i=0;$i<$numfields;$i++){
        $fieldname=mysql_field_name($rs,$i);
        $xmlfile.="<" . $fieldname . ">" . $row[$i] . "</" . $fieldname . ">\n";
    }
}
mysql_free_result($rs);
mysql_close($connect_id);
$xmlfile.="</books>\n";
$fp=fopen("xmldoc/xmldoc.xml","w");
if(fwrite($fp,$xmlfile)){
    echo "写入文件成功!";
}
else{
    echo "写入文件失败!";
}
?>

这段是从XML里取数据转化成HTML的源代码。。。
<?
class xml{
    var $parser;

    function xml(){
        $this->parser = xml_parser_create();
        xml_set_object($this->parser,&$this);
        xml_set_element_handler($this->parser,"tag_on","tag_off");
        xml_set_character_data_handler($this->parser,"cdata");
    }
    
    function parse($data){
        xml_parse($this->parser,$data);
    }
    
    function tag_on($parser,$tag,$attributes){
        if(xml_get_current_line_number($parser)==2){
            echo "<tr><td colspan=\"2\" align=\"center\">" . $tag . "</td>";
        }
        else{
            switch ((xml_get_current_line_number($parser)-2)%6){
                case 0:
                    echo "<tr><td>下载<td>";
                    break;
                case 1:
                    echo "<tr><td>ID号<td>";
                    brea