来自经典的打造简单的PHP&MYSQL留言板第3/4页

<?php
require_once("conn.php");
$username = $_POST['name'];
$sex = $_POST['sex'];
$qq = $_POST['qq'];
$email = $_POST['email'];
$info = $_POST['info'];

if (strrpos($username,"<")!==false || strrpos($username,">")!==false||strrpos($username,"@")!==false||strrpos($username,"\"")!==false||strrpos($username,"'")!==false||strrpos($username,"_")!==false)
{
    echo "<script>alert('名称不能有特殊字符！');location.href='post.php';</script>";
    exit();
}

if (!ereg("^[0-9]{0,}$",$qq))//用正则检查QQ格式
{
    echo "<script>alert('OICQ信息有错误！必须是数字！');location.href='post.php';</script>";
    exit();
}

if($email)
{//如果填写了邮箱就用正则检查邮箱格式
    if (!ereg("^[a-zA-Z0-9_\-\.]+@[a-zA-Z0-9\-]+\.[a-zA-Z0-9\-\.]+$",$email))
    {
        echo "<script>alert('email格式不正确！');location.href='post.php';</script>";
        exit();
    }
}

if(!$username)
{
    echo "<script>alert('名称不能为空哦！');location.href='post.php';</script>";
    exit();
}
elseif(!$info)
{
    echo "<script>alert('留言不能为空哦！');location.href='post.php';</script>";
    exit();
}
else
{
    $ip = getenv('REMOTE_ADDR');//获取客户端IP地址

    $sql = "insert into lo (username,sex,qq,email,info,ip,submit_time) values ('$username','$sex','$qq','$email','$info','$ip',NOW())";

    $result = mysql_query($sql);

    mysql_close();

    echo "<script>alert('提交成功！返回首页');location.href='index.php';</script>";
}
?>

<?php
session_start();
require_once('conn.php');
require_once('header.php');


if($_SESSION["key"]==1)
{
$id = $_GET['id'];
$sql = "select * from lo where id= ".$id;
$result = mysql_query($sql);
$row = mysql_fetch_array($result);

?>

<div id="update">
    <form action="updatepost.php?wuleying&id=<?= $row[0] ?>" method="post">
        <h1>修改留言</h1>
        <p>姓名：<input type="text" value="<?= $row[1]?>" name="name" class="y"></input></p>
        <p>留言：</p>
        <p><textarea  name="info" rows="5" cols="35"><?= $row[5] ?></textarea></p>
        <p class="cen"><input type="submit" value="偶要修改" /></p>
        <p class="cen1">银子留言板 Version 1.0</p>
    </form>

<div>


<?php
}
else
{
header('location:index.php');
}
?>