PHP+XML 制作简单的留言本 图文教程_php实例
1. 留言显示页面
2. 发布留言,并允许上传图片
3. 输入密码登录后可以删除留言。
1. 文件目录
upfile是保存上传图片的目录。
2. 主要界面
(1)首页,显示留言页面
(2)发表留言页面
3. XML文档格式,名称为data.xml
各字段的含义不多说,各元素的值看起来有点怪,是因为我使用了base64_encode对字符串进行了编码。
4 主要页面代码
(1)add.php
此页只是纯粹的HTML代码
(2)savadd.php
用于保存留言信息
if(!$_POST["author"] || !$_POST["content"])
{
echo "\n";
echo "你没有填写留言姓名或内容,2秒钟返回首页";
exit();
}else{
$imgflag=0; //用于判断是否需要上传图片
function random($length) //此函数用于生成一个随机的图片文件名(不含扩展名),以防止与现有图片重复
{
$hash = 'IMG-';
$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
$max = strlen($chars) - 1;
for($i = 0; $i {
$hash .= $chars[mt_rand(0, $max)];
}
return $hash;
}
function fileext($filename) //此函数用于获取上传文件的扩展名
{
return substr(strrchr($filename, '.'), 1);
}
if($_FILES["upfile"]["name"]!=""){
$uploaddir="upfile/"; //图片保存路径
$type=array("jpg","gif","bmp","jpeg","png"); //允许上传的文件类型
if(!in_array(strtolower(fileext($_FILES['upfile']['name'])),$type)) //如果上传的文件的扩展名不符合要求
{
echo "\n";
$text=implode(",",$type);
echo "您只能上传以下类型文件: ",$text,"
";
exit();
}
else
{
$filename=explode(".",$_FILES['upfile']['name']);
do
{
$filename[0]=random(10);
$randname=implode(".",$filename); //得到的最终随机生成的文件名(连同扩展名)
$uploadfile=$uploaddir.$randname;
} while(file_exists($uploadfile));
if (move_uploaded_file($_FILES['upfile']['tmp_name'],$uploadfile)){ //保存上传的图片到upfile文件夹
echo "上传图片成功";
$imgflag=1;
}
else{
echo "上传图片失败!";
$imgflag=0;
}
}
}
//获取其他表单域
$author=base64_encode($_POST["author"]);
$content=base64_encode(ereg_replace("\r\n","
",$_POST["content"]));
$smiles=base64_encode($_POST["smiles"]);
if($_POST["title"]){
$title=base64_encode($_POST["title"]);
}else{
$title=base64_encode("无标题");
}
$addtime=date("Y-m-d");
if($imgflag==1){ //如果有上传图片
$photo=base64_encode($randname);
}else{ //否则将photo元素的值设置为NONE
$photo="NONE";
}
$dom=new DOMDocument('1.0','gb2312'); //指定XML的格式
$dom->load("data.xml"); //加载
$root=$dom->getElementsByTagName("messages"); //获取根节点
$root=$root->item(0);
$last_id=$root->lastChild->firstChild->nodeValue; //获取最后一个message的第一个子节点(即id节点)的值
$id=$last_id+1; //新增消息的id
settype($id,"string"); //将其转换为字符型
$message=$root->appendChild(new DOMElement('message')); //添加message节点
$el_id=$message->appendChild(new DOMElement('id')); //添加message节点的各个子节点
$el_id->appendChild($dom->createTextNode($id));
$el_author=$message->appendChild(new DOMElement('author'));
$el_author->appendChild($dom->createTextNode($author));
$el_title=$message->appendChild(new DOMElement('title'));
$el_title->appendChild($dom->createTextNode($title));
$el_smiles=$message->appendChild(new DOMElement('smiles'));
$el_smiles->appendChild($dom->createTextNode($smiles));
$el_content=$message->appendChild(new DOMElement('content'));
$el_content->appendChild($dom->createTextNode($content));
$el_addtime=$message->appendChild(new DOMElement('addtime'));
$el_addtime->appendChild($dom->createTextNode($addtime));
$el_photo=$message->appendChild(new DOMElement('photo'));
$el_photo->appendChild($dom->createTextNode($photo));
$dom->save("data.xml"); //保存XML
echo "\n";
echo "谢谢您的留言,2秒钟返回首页";
}
?>
(3)index.php
本页面用于显示留言信息
$dom=new DOMDocument('1.0','gb2312');
$dom->load("data.xml"); //加载
$root=$dom->getElementsByTagName("messages");
$root=$root->item(0);
$message=$root->getElementsByTagName("message"); //获取所有message节点
$message_count=$message->length; //计算有多少条留言
echo "当前共有".$message_count."条留言";
if($message_count==0){
echo "暂时没有留言\n";
}else{
?>
"; echo $id.". ![]() if(isset($_SESSION["password"]) && $_SESSION["password"]!="") //如果输入了密码显示删除链接 { echo "[删除]"; } echo " |
".base64_decode($content)." |
![]() |
if(isset($_SESSION["password"]) && $_SESSION["password"]!=""){
?>
}else{
?>
}
?>
(4) 删除留言
if(isset($_SESSION["password"]) && $_SESSION["password"]!="")
{
$dom=new DOMDocument;
$dom->load("data.xml");
$root=$dom->getElementsByTagName("messages");
$root=$root->item(0);
foreach($root->childNodes as $msg)
{
if($msg->firstChild->nodeValue==$_GET["id"]) //如果message节点的id子节点的值跟要删除的id相等
{
$photo=$msg->lastChild->nodeValue;
if($photo!="NONE"){ //如果留言包含图片,还应该将图片删除
$photo_path="upfile/".base64_decode($photo);
$flag=unlink($photo_path);
if($flag){
echo "删除图片成功
";
}
}
$root->removeChild($msg);
break;
}
}
$dom->save("data.xml");
?>
删除留言成功,2秒钟返回首页
}else{
?>
您还未登陆,2秒钟返回登陆页面
}
?>

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