PHP development message board tutorial - adding messages
Let’s look at the following html code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>留言板</title>
<style type="text/css">
*{margin:0px;padding:0px;}
body{background:#eee;}
#bdy{width:414px;height:736px;margin:0 auto;margin-top:20px;
background:#66CDAA;
}
#top{font-family:"隶书";font-size:30px;text-align:center;/*margin-top:18px;*/
color:#f60;}
.a{text-decoration:none;color:#fff;float:right;padding-right:15px;}
.a:hover{color:red;}
#cont{width:414px;height:736px;margin:0 auto;margin-top:20px;}
#left{width:350px;height:300px;margin-top:80px;margin-left:15px;/*float:left;*/
background:#48D1CC;padding-left:5px;}
#right{width:360px;height:200px;margin-top:20px;background:#48D1CC;
margin-left:15px;/*float:left;*/}
h5{text-align:center;margin-top:15px;margin-bottom:20px;}
#sub{width:120px;height:25px;margin-top:15px;}
#sub:hover{background:#AFEEEE;}
.span{font-size:18px;color:red;font-weight:bold;}
table{width:360px;margin:0 auto;margin-top:15px;border:1px solid #eee;}
td{text-align:center;}
#td a{text-decoration:none;color:#eee;}
#td a:hover{color:red;}
</style>
</head>
<body>
<div id="bdy">
<div id="top">留言板</div>
<a href="login.php" class="a">登录</a>
<a href="reg.php" class="a">注册</a>
<div id="cont">
<div id="left">
<h5>写留言</h5>
<form method="post" action="addmessage.php">
标题：<input type="text" placeholder="请输入标题" name="title">
</br></br>
内容：<textarea cols="40" rows="5" name="content"></textarea>
</br></br>
<input type="submit" value="添加留言" id="sub">
</form>
</div>
<div id="right"></div>
</div>
</div>
</body>
</html>The form is submitted to addmessage.php, let’s look at the following addmessage.php file in detail
We must also open the session first
session_start();
Note: Open seession at this time for our judgment later. If you are logged in, you can leave a message. Otherwise, you cannot leave a message.
Introduce the connection database file conn .php
require_once('conn.php');
Set character encoding
header("Content-type: text/html; charset=utf-8") ;//Set encoding
Next we need to get the form information
$title = $_POST['title'];
$content = $_POST['content'];
$messtime = time();
Next we have to add a message
If the title and content are not filled in, we should not let him submit
if(empty($title)){
echo "<script>alert('Please enter a title');history.go(-1);</script>";
}elseif (empty($content)){
echo "<script>alert('Please enter content');history.go(-1);</script>";
}
Otherwise, you should be able to add the following code:
if(!empty($_SESSION['name'])){
$sql = "insert into mess (title,content,messtime) VALUES ('$ Title', '$ Content', '$ Messtime') ");
$ result = mysql_query ($ SQL);
if ($ result) {
echo" & lt; script & gt ; Alert ('Add message successfully');location.href='message.php';</script>";
echo "< .go(-1);</script>";
; Let the user log in and leave a message
The complete code is as follows:
<?php
session_start();
header("Content-type: text/html; charset=utf-8");//设置编码
require_once('conn.php');
$title = $_POST['title'];
$content = $_POST['content'];
$messtime = time();
if(empty($title)){
echo "<script>alert('请输入标题');history.go(-1);</script>";
}elseif(empty($content)){
echo "<script>alert('请输入内容');history.go(-1);</script>";
}else{
if(!empty($_SESSION['name'])){
$sql = "insert into mess (title,content,messtime) values('$title','$content','$messtime')";
$result =mysql_query($sql);
if($result){
echo "<script>alert('添加留言成功');location.href='message.php';</script>";
}else{
echo "<script>alert('添加留言失败');history.go(-1);</script>";
}
}else{
echo "<script>alert('请登录后添加留言');history.go(-1);</script>";
}
}
?> 
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