php创建一个简单的留言板-下

来源：互联网发布：数据统计与分析方法编辑：程序博客网时间：2024/05/19 20:48

知识点：

首先建立一个head.php文件

会显示这种页面

在add.php文件里加入include("head.php");此语句

add.php代码；

<?php include("link.php"); if($_POST['submit']){  $sql="insert into message (id,user,title,content,lastdate)"."value('','$_POST[user]','$_POST[title]','$_POST[content]',now())";mysql_query($sql);  echo "<script language=\"javascript\">alert('添加成功');history.go(-1)</script>"; } include("head.php");?><SCRIPT language=javascript>function CheckPost(){if (myform.user.value==""){alert("请输入用户名");myform.user.focus();return false;}if (myform.title.value.length<5){alert("标题不能少于5个字符");myform.title.focus();return false;}if(myform.content.value==""){alert("内容不能为空");myform.content.focus();return false;}}</SCRIPT> <form action="add.php" method="post" name="myform" onsubmit="return CheckPost();">  用户：<input type="text"  size="10" name="user"/><br>  标题: <input type="text" name="title" /><br>  内容：<textarea name="content"></textarea><br><br/>  <input type="submit" name="submit" value="发表留言"/>  </form>

建立conn.php文件用来实现显示空格，回车等替换功能

<?php$conn = @ mysql_connect("localhost", "root", "123456") or die("数据库链接错误");mysql_select_db("bbs", $conn);mysql_query("set names 'GBK'"); //使用GBK中文编码;function htmtocode($content) {$content = str_replace("\n", "<br>", str_replace(" ", " ", $content));  //把键盘输入的空格回车符号，转换为php代码能识别显示的符号return $content;}//$content=str_replace("'","‘",$content); //htmlspecialchars();?>

建立登陆页面

<?phpinclude("link.php");  if($_GET[out]){  setcookie("cookie", "out");    echo "<script language=\"javascript\">location.href='login.php';</script>";  }  if($_POST[id]=='admin'){    $pw=md5($_POST[pw]);    if($pw=='e1bfd762321e409cee4ac0b6e841963c'){     setcookie("cookie", "ok");       echo "<script language=\"javascript\">location.href='login.php';</script>";    }  }include("head.php");if($_COOKIE['cookie']!='ok'){?><SCRIPT language=javascript>function Checklogin(){if (myform.id.value==""){alert("请填写登录名");myform.id.focus();return false;}if (myform.pw.value==""){alert("密码不能为空");myform.pw.focus();return false;}}</SCRIPT><form action="" method="post" name="myform" onsubmit="return Checklogin();">  ID：<input type="text" name="id" /><br>  PW：<input type="password" name="pw" /> <input type="submit" name="submit" value="登陆"/>  </form><?}else{?><a href='?out=login'>退出</a><?}?>

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