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老师批语：
index:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/22 0022
* Time: 下午 2:15
*/
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<?php
include "includes/header.inc.php";
session_start();
//if (!empty($_COOKIE)) {
if (!isset($_SESSION['username'])) {
echo '<a href="login_page.php">登录</a>';
} else {
echo '<a href="loginout.php">退出</a>';
} ?>
</body>
</html>
login:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/22 0022
* Time: 下午 2:49
*/
//加载公共函数库
require ('includes/function.php');
//连接数据库
require ('includes/connect.php');
session_start();
//验证登录
//$check=true/false; $data=['user_id'=>$user_id, 'user_name'=>$user_name];
list($check, $data) = check_login($conn, $_POST['username'], $_POST['password']);
//验证通过
if ($check) {
//设置cookies
// setcookie('username', $data['dg_username']);
// setcookie('password', $data['dg_password']);
$_SESSION['username']=$data['dg_username'];
$_SESSION['password']=$data['dg_password'];
//跳转页面
jump_next('login_inside.php');
} else {
//验证失败
$errors = $data;
}
//关闭数据库连接
mysqli_close($dbc);
login_inside:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/22 0022
* Time: 下午 3:00
*/
session_start();
//if (!isset($_COOKIE['username'])) {
if (!isset($_SESSION['username'])) {
require "includes/function.php";
//跳转到默认首页
jump_next();
}
$page_title = '已经登录';
include ('includes/header.inc.php');
echo <<< "WELCOME"
<h2 style="color:red">登陆成功</h2>
<!--<p>欢迎您: {$_COOKIE['username']}</p>-->
<p>欢迎您: {$_SESSION['username']}</p>
<p><a href="loginout.php">退出</a></p>
WELCOME;
login_page:
<?php
/**
* 登录页面并报告错误
* 设置当前页面的标题
* 在login.php中调用
*/
$page_title = '用户登录';
//加载头部文件
include('includes/header.inc.php');
//打印错误信息
if (isset($errors) && !empty($errors)) {
$errors_msg = '<p style="color:red">';
foreach ($errors as $msg) {
$errors_msg .= $msg.'<br>';
}
echo $errors_msg.'</p>';
}
?>
<h2 style="color:red">用户登录</h2>
<form action="login.php" method="post">
<p>
<label for="username">用户:</label>
<!--使用粘性表单技术在文本框中显示用户之前输入的内容，提升用户体验-->
<input type="text" name="username" id="username" value="<?php echo isset($_POST['username'])?$_POST['username']:'' ?>">
</p>
<p>
<label for="password">密码:</label>
<input type="password" name="password" id="password" value="<?php echo isset($_POST['password'])?$_POST['password']:'' ?>">
</p>
<p><button type="submit" name="submit" id="submit">登录</button></p>
</form>
loginout:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/22 0022
* Time: 下午 3:33
*/
include ('includes/header.inc.php');
session_start();
//if (!isset($_COOKIE['username'])) {
if (!isset($_SESSION['username'])) {
require ('includes/function.php');
//跳转到默认首页
jump_next();
} else { //删除cookies
// setcookie('username', '', time()-3600*3);
// setcookie('password','', time()-3600*3);
unset($_SESSION['username']);
unset($_SESSION['password']);
}
//设置页面标题
$page_title = '已经登录';
//打印退出信息,并提供登录功能
echo <<< "WELCOME"
<h2 style="color:red">退出成功</h2>
<p><a href="login_page.php">登录</a></p>
WELCOME;
connect:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/22 0022
* Time: 下午 2:37
*/
//数据库连接
define("DB_HOST", "localhost");
define("DB_USER", "root");
define("DB_PAW", "root");
define("DB_NAME", "testguest");
$conn = @mysqli_connect(DB_HOST, DB_USER, DB_PAW, DB_NAME) or die("数据库连接失败");
//如上的@符号可以屏蔽当数据库连接失败的警告。只显示想要展示的错误信息
//mysqli_select_db($dbname) 如果在@mysqli_connect 中没有选择指定的数据库 那么使用mysqli_select_db($dbname) or die("指定数据库不存在");
mysqli_query($conn, "SET NAMES UTF8") or die("字符集错误");//这样设置可以
//$conn->set_charset("utf8") or die("字符集错误");//这样设置字符集也可以
function:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/22 0022
* Time: 下午 2:19
*/
function jump_next($page = 'index.php'){
//默认url格式
$url = 'http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']);
//如果有,去掉url右侧的斜线
$url = rtrim($url, '/\\');
//添加上当前的脚本名称,默认为:index.php
$url .= '/'.$page;
//跳转到指定目标地址
header('Location:'. $url);
exit();
}
function check_login($conn,$username,$password){
//验证用户名
if (empty($username)) {
$errors[] = '用户名不能为空';
} else {
//mysqli_real_escape_string():转义字符串的特殊字符
$e = mysqli_real_escape_string($conn, trim($username));
}
//验证密码
if (empty($password)) {
$errors[] = '密码不能为空';
} else {
$p = mysqli_real_escape_string($conn, trim($password));
}
if (empty($errors)){
$sql = "SELECT * FROM tg_user WHERE dg_username='$username'";
$res = mysqli_query($conn,$sql);
echo "<pre>";
print_r($res);
$row = mysqli_fetch_array($res,MYSQL_ASSOC);
print_r($row);
if ($row!=NULL){
return [true, $row];
}else{
return [FALSE ,"没有改用户"];
}
}
return [FALSE ,$errors];
}
header.inc:
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/4/22 0022
* Time: 下午 2:12
*/
header("content-type:text/html;charset=utf-8");
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>
<?php
echo isset($page_title) ? $page_title : '首页';
?></title>
</head>
<body>
<h3>头部</h3>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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