PHP+XML making a simple guestbook graphic tutorial

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PHP+XML making a simple guestbook graphic tutorial_PHP tutorial

Jul 21, 2016 pm 03:42 PM

upload make release back Graphics and text picture password Tutorial show message Log in of Simple enter page

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

<?php
if(!$_POST["author"] || !$_POST["content"])
{
echo "<meta http-equiv=\"refresh\" content=\"2;url=index.php\">\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 < $length; $i++) //从上面的字符串中随机找length长度个字符
{
$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 "<meta http-equiv=\"refresh\" content=\"2;url=index.php\">\n";
   $text=implode(",",$type);
   echo "您只能上传以下类型文件: ",$text,"<br>";
   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"]);
$content=base64_encode(ereg_replace("\r\n","<br>",$_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 "<meta http-equiv=\"refresh\" content=\"2;url=index.php\">\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

<?php
$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($message_count==0){
echo "暂时没有留言\n";
}else{
?>
<table border="1" width="700">
<?php
for($i=$message_count-1;$i>=0;$i--)    //我们需要对留言按倒序排列
{
  $msg=$message->item($i);

  foreach($msg->childNodes as $child)   //message节点的各个子节点
  {
   if($child->nodeName=="id")
   {
    $id=$child->nodeValue;
   }
   if($child->nodeName=="author")
   {
    $author=$child->nodeValue;
   }
   if($child->nodeName=="title")
   {
    $title=$child->nodeValue;
   }
   if($child->nodeName=="smiles")
   {
    $smiles=$child->nodeValue;
   }
   if($child->nodeName=="content")
   {
    $content=$child->nodeValue;
   }
   if($child->nodeName=="photo")
   {
    $photo=$child->nodeValue;
   }
   if($child->nodeName=="addtime")
   {
    $addtime=$child->nodeValue;
   }

  }
  echo "<tr>";
  echo "<td align=left bgcolor=#CCCCFF>";
  echo $id.".<img src='smiles/".base64_decode($smiles)."'>".base64_decode($title)." - ".base64_decode($author)." [".$addtime."] ";
  if(isset($_SESSION["password"]) && $_SESSION["password"]!="") //如果输入了密码显示删除链接
  {
   echo "[<a href='del.php?id=".$id."'>删除</a>]";
  }
  echo "</td></tr>";
  echo "<tr><td align=left>".base64_decode($content)."</td></tr>";
  if($photo!="NONE")
  {
   echo "<tr><td align=left><img src='upfile/".base64_decode($photo)."'></td></tr>";
  }
}
?>
<?php
}
?>
</table>
<?php
if(isset($_SESSION["password"]) && $_SESSION["password"]!=""){
?>
<p><a href="logout.php">退出管理</a></p>
<?php
}else{
?>
<p><a href="login.php">登陆管理</a></p>
<?php
}
?>

(4) 删除留言

<?php
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"]) //If the value of the id child node of the message node is equal to the id to be deleted
{
$photo=$msg->lastChild->nodeValue;
if($photo! ="NONE"){ //If the message contains pictures, the pictures should also be deleted
$photo_path="upfile/".base64_decode($photo);
$flag=unlink($photo_path);
if($flag){
echo "Picture deleted successfully<br>";
}
}

$root->removeChild($msg);
break;
}
}
$dom->save("data.xml");

Delete message successfully, return to homepage in 2 seconds
<meta http-equiv="refresh" content="2;url=index.php">
<?php
}else {
?>
You are not logged in yet, return to the login page in 2 seconds
<meta http-equiv="refresh" content="2;url=login.php">
<?php
}
?>

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