php xml留言板 xml存储数据的简单例子_PHP教程

class xmldb extends DOMDocument{
var $xmldb;
public function __construct($xmldbname){
$this->xmldb=$xmldbname;
if(!file_exists($this->xmldb)){
$initxmldb = "";
$this->loadXML($initxmldb);
$this->save($this->xmldb);
}else{
$this->load($this->xmldb);
}

}
public function insert_message($nickname,$message){

$messagedom = $this->getElementsByTagName("Message");
$subnode = $this->createElement("Rows");
$nicknamenode = $this->createElement("Nickname");
$nicknamenode -> appendChild($this->createTextNode($nickname));
$subnode -> appendChild($nicknamenode);
$contentnode = $this->createElement("Content");
$contentnode -> appendChild($this->createTextNode($message));
$subnode -> appendChild($contentnode);
$timernode = $this->createElement("Timer");
$timernode -> appendChild($this->createTextNode(time()));
$subnode -> appendChild($timernode);
$messagedom->item(0)->appendChild($subnode);
$this->saveXML();
$this->save($this->xmldb);
}
function get_node_length($nodename){

$odom = $this->getElementsByTagName($nodename);
return $odom->length;
}
public function get_message_list($start,$rowscount,$pagesize){
$end = $rowscount > $pagesize ? $start+$pagesize : $rowscount;

$k = 0;
for($i = $start; $i < $end; $i++){
$rowslist[$k]["Nickname"] = $this->getElementsByTagName("Nickname")->item($i)->nodeValue;
$rowslist[$k]["Content"] = $this->getElementsByTagName("Content")->item($i)->nodeValue;
$rowslist[$k]["Timer"] = $this->getElementsByTagName("Timer")->item($i)->nodeValue;
$k++;
}
return $rowslist;
}
public static function splitpage($pageall,$page=1,$urled=null,$strpage = "page",$pageaverage = 10){
$pageaverage -= 1;
$page = intval($page >=1 ? $page : 1 );
$page = $page > $pageall ? $pageall : $page;
$startpage = $page - $pageaverage > 0 ? $page - ceil(($pageaverage / 2)):1;
$startpage = ($page + ceil($pageaverage/2) > $pageall)?$pageall-$pageaverage:$startpage;

$startpage = $startpage > 0 ? $startpage : 1;
$stoppage = $startpage+$pageaverage >$pageall?$pageall:$startpage+$pageaverage;
if(empty($urlfile)){ $urlfile=$_SERVER["PHP_SELF"]; }
if(!strrpos($urlfile,'?')) $urled .= '?';
foreach($_GET as $k => $v)
{
$urled = ($k<>$strpage) ? $urled.$k.'='.urlencode($v).'&' : $urled;
}
if ($page>1){
$mess ="首页 ";
$mess .="上一页 ";
}else{
$mess ="首页 ";
$mess .="上一页 ";
}
if($page > 9){
$startpage = $page - 9;
}
$stoppage = $startpage + 9 >= $pageall ? $pageall : $startpage + 9;
for($i= $startpage; $i<= $stoppage ;$i++)
{
if($i<= $pageall && !($page==$i))
$mess .= "".$i." ";
else
$mess .= "".$i." ";
}
if ($page < $pageall){
$mess .=" 下一页";
$mess .=" 尾页";
}else{
$mess .=" 下一页";
$mess .=" 尾页";
}
return $mess;
}
}
?>

require("_class.xmldb.inc.php");
$xmldb = new xmldb("./my_xmldb.xml");
if(isset($_POST["btnform1"])){
$xmldb -> insert_message($_POST["nickname"],$_POST["content"]);
}
$pagesize = 3;
$page = !empty($_GET['page']) ? intval($_GET['page']) : 1;
$rowscount = $xmldb -> get_node_length("Rows");
$pagecount = ceil($rowscount/$pagesize);
$start = ($page-1)*$pagesize > $rowscount ? $rowscount : ($page-1)*$pagesize;
$rowslist = $xmldb -> get_message_list($start,$rowscount,$pagesize);
?>









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