用php实现动态产生xml文件以及从xml文件中抽取数据转化成html的

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。。。