php xml留言板 xml存储数据的简单例子

<?php 
class xmldb extends DOMDocument{ 
    var $xmldb; 
    public function __construct($xmldbname){ 
        $this->xmldb=$xmldbname; 
        if(!file_exists($this->xmldb)){ 
            $initxmldb = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Message></Message>"; 
            $this->loadXML($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){ 
                $mess ="<a href="".$urled.$strpage."=1" href="".$urled.$strpage."=1">首页</a> "; 
                $mess .="<a href="".$urled.$strpage."=".($page-1)."" href="".$urled.$strpage."=".($page-1)."">上一页 </a>"; 
            }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)) 
                    $mess .= "<a href="".$urled.$strpage."=".$i."" href="".$urled.$strpage."=".$i."">".$i."</a> "; 
                else 
                    $mess .= "".$i." "; 
            } 
            if ($page < $pageall){ 
                $mess .=" <a href="".$urled.$strpage."=".($page+1)."" href="".$urled.$strpage."=".($page+1)."">下一页</a>"; 
                $mess .=" <a href="".$urled.$strpage."=".$pageall."" href="".$urled.$strpage."=".$pageall."">尾页</a>"; 
            }else{ 
                $mess .=" 下一页"; 
                $mess .=" 尾页"; 
            } 
        return $mess; 
    } 
} 
?> 
 
调用文件 : index.php 
 代码如下:

<?php 
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); 
?> 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 
<HTML> 
<HEAD> 
<meta http-equiv="content-type" content="text/html;charset=utf-8"> 
<TITLE> New Document </TITLE> 
    <style type='text/css'><!-- 
        #messagelist ul li{ float:left;list-style-type:none; } 

--></style><style type='text/css' bogus="1">        #messagelist ul li{ float:left;list-style-type:none; } 
    </style> 
</HEAD> 
<BODY> 
    <div id="messagelist"> 
    <?php 
        if(!empty($rowslist)) 
        { 
            foreach($rowslist as $key => $value) 
            { 
                echo "<ul><li>".$value["Nickname"]." <span>(".date("Y-m-d H:i",$value["Timer"]).")</span></li>"; 
                echo "<li>".$value["Content"]."</li></ul><br>"; 
            } 
        } 
    ?> 
        <div><?=$xmldb -> splitpage($pagecount,$page,'','page',$pagesize)?></div> 
    </div> 
    <div> 
        <form action="" method="post" name="form1"> 
            昵称:<input type="text" name="nickname"><br> 
            内容:<textarea name="content"> 
 
php操作xml的简单留言板，带分页，仅供参考