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PHP 附录 : 用户注册与登录完整代码

创建时间：2013-09-06 投稿人： 浏览次数：102

login.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>用户登录</title>
<style type="text/css">
    html{font-size:12px;}
    fieldset{width:520px; margin: 0 auto;}
    legend{font-weight:bold; font-size:14px;}
    label{float:left; width:70px; margin-left:10px;}
    .left{margin-left:80px;}
    .input{width:150px;}
    span{color: #666666;}
</style>
<script language=JavaScript>
<!--

function InputCheck(LoginForm)
{
  if (LoginForm.username.value == "")
  {
    alert("请输入用户名!");
    LoginForm.username.focus();
    return (false);
  }
  if (LoginForm.password.value == "")
  {
    alert("请输入密码!");
    LoginForm.password.focus();
    return (false);
  }
}

//-->
</script>
</head>
<body>
<div>
<fieldset>
<legend>用户登录</legend>
<form name="LoginForm" method="post" action="login.php" onSubmit="return InputCheck(this)">
<p>
<label for="username" class="label">用户名:</label>
<input id="username" name="username" type="text" class="input" />
<p/>
<p>
<label for="password" class="label">密 码:</label>
<input id="password" name="password" type="password" class="input" />
<p/>
<p>
<input type="submit" name="submit" value="  确 定  " class="left" />
</p>
</form>
</fieldset>
</div>
</body>
</html>

conn.php

<?php
/*****************************
*数据库连接
*****************************/
$conn = @mysql_connect("localhost","root","root123");
if (!$conn){
    die("连接数据库失败：" . mysql_error());
}
mysql_select_db("test", $conn);
//字符转换，读库
mysql_query("set character set "gbk"");
//写库
mysql_query("set names "gbk"");
?>

reg.php

<?php
if(!isset($_POST["submit"])){
    exit("非法访问!");
}
$username = $_POST["username"];
$password = $_POST["password"];
$email = $_POST["email"];
//注册信息判断
if(!preg_match("/^[wx80-xff]{3,15}$/", $username)){
    exit("错误：用户名不符合规定。<a href="javascript:history.back(-1);">返回</a>");
}
if(strlen($password) < 6){
    exit("错误：密码长度不符合规定。<a href="javascript:history.back(-1);">返回</a>");
}
if(!preg_match("/^w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*$/", $email)){
    exit("错误：电子邮箱格式错误。<a href="javascript:history.back(-1);">返回</a>");
}
//包含数据库连接文件
include("conn.php");
//检测用户名是否已经存在
$check_query = mysql_query("select uid from user where username="$username" limit 1");
if(mysql_fetch_array($check_query)){
    echo "错误：用户名 ",$username," 已存在。<a href="javascript:history.back(-1);">返回</a>";
    exit;
}
//写入数据
$password = MD5($password);
$regdate = time();
$sql = "INSERT INTO user(username,password,email,regdate)VALUES("$username","$password","$email",
$regdate)";
if(mysql_query($sql,$conn)){
    exit("用户注册成功！点击此处 <a href="login.html">登录</a>");
} else {
    echo "抱歉！添加数据失败：",mysql_error(),"<br />";
    echo "点击此处 <a href="javascript:history.back(-1);">返回</a> 重试";
}
?>

login.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>用户登录</title>
<style type="text/css">
    html{font-size:12px;}
    fieldset{width:300px; margin: 0 auto;}
    legend{font-weight:bold; font-size:14px;}
    .label{float:left; width:70px; margin-left:10px;}
    .left{margin-left:80px;}
    .input{width:150px;}
    span{color: #666666;}
</style>
<script language=JavaScript>
<!--

function InputCheck(LoginForm)
{
  if (LoginForm.username.value == "")
  {
    alert("请输入用户名!");
    LoginForm.username.focus();
    return (false);
  }
  if (LoginForm.password.value == "")
  {
    alert("请输入密码!");
    LoginForm.password.focus();
    return (false);
  }
}

//-->
</script>
</head>
<body>
<div>
<fieldset>
<legend>用户登录</legend>
<form name="LoginForm" method="post" action="login.php" onSubmit="return InputCheck(this)">
<p>
<label for="username" class="label">用户名:</label>
<input id="username" name="username" type="text" class="input" />
<p/>
<p>
<label for="password" class="label">密 码:</label>
<input id="password" name="password" type="password" class="input" />
<p/>
<p>
<input type="submit" name="submit" value="  确 定  " class="left" />
</p>
</form>
</fieldset>
</div>
</body>
</html>

login.php

<?php
session_start();

//注销登录
if($_GET["action"] == "logout"){
    unset($_SESSION["userid"]);
    unset($_SESSION["username"]);
    echo "注销登录成功！点击此处 <a href="login.html">登录</a>";
    exit;
}

//登录
if(!isset($_POST["submit"])){
    exit("非法访问!");
}
$username = htmlspecialchars($_POST["username"]);
$password = MD5($_POST["password"]);

//包含数据库连接文件
include("conn.php");
//检测用户名及密码是否正确
$check_query = mysql_query("select uid from user where username="$username" and password="$password" 
limit 1");
if($result = mysql_fetch_array($check_query)){
    //登录成功
    $_SESSION["username"] = $username;
    $_SESSION["userid"] = $result["uid"];
    echo $username," 欢迎你！进入 <a href="my.php">用户中心</a><br />";
    echo "点击此处 <a href="login.php?action=logout">注销</a> 登录！<br />";
    exit;
} else {
    exit("登录失败！点击此处 <a href="javascript:history.back(-1);">返回</a> 重试");
}
?>

my.php

<?php
session_start();

//检测是否登录，若没登录则转向登录界面
if(!isset($_SESSION["userid"])){
    header("Location:login.html");
    exit();
}

//包含数据库连接文件
include("conn.php");
$userid = $_SESSION["userid"];
$username = $_SESSION["username"];
$user_query = mysql_query("select * from user where uid=$userid limit 1");
$row = mysql_fetch_array($user_query);
echo "用户信息：<br />";
echo "用户ID：",$userid,"<br />";
echo "用户名：",$username,"<br />";
echo "邮箱：",$row["email"],"<br />";
echo "注册日期：",date("Y-m-d", $row["regdate"]),"<br />";
echo "<a href="login.php?action=logout">注销</a> 登录<br />";
?>
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