PHP 的会话控制，cookie session-2018-8-31

实例

<?php
session_start();

if(!isset($_SESSION['id'])){
    require 'inc/function.php';
    redirect_user();
}else{
    session_destroy();
    setcookie('PHPSESSID',time()-3600);
}


$page_title ='退出成功';

include 'inc/header.php';

echo <<< "WELCOME"
<h2 style="color: palegreen">
<p>请常回家看看</p>
<p><a href="index.php">返回首页</a></p>
</h2>
WELCOME;

include 'inc/footer.php';

实例

<?php
//开始session
session_start();

if ($_SERVER['REQUEST_METHOD']=='POST'){

    //加载函数库
    require 'inc/function.php';

    //连接数据库
    require 'inc/connect.php';
    //验证登录

   list ($check,$data)=check_login($dbc,$_POST['email'],$_POST['password']);

   if($check){
       $_SESSION['id']=$data['id'];
       $_SESSION['name']=$data['name'];
       //进行跳转
       redirect_user('loggedin.php');
   }else{
       $errors=$data;
   }
    mysqli_close($dbc);

}

include 'login_page.php';

实例

<?php
$page_title='我是首页';
include 'inc/header.php';
echo '<H2 style="color: red">我是首页</H2>';

//判断用户是否登录
//获取当前页面地址 basename($_SERVER['PHP_SELF'])
//echo basename($_SERVER['PHP_SELF']);
if(isset($_COOKIE['id']) && basename($_SERVER['PHP_SELF'])!='login.php'){
    echo '<a href="logout.php">退出</a>';
}else{
    echo '<a href="login.php">登录</a>';
}






include 'inc/footer.php';

实例

<?php
session_start();
if(!isset($_SESSION['id'])){
    require 'inc/function.php';
    redirect_user();
}


$page_title ='登录成功';

include 'inc/header.php';

echo <<< "WELCOME"
<h2 style="color: aquamarine">
<p>欢迎您：亲爱的{$_SESSION['name']}</p>
<p><a href="logout.php">退出</a></p>
</h2>
WELCOME;

include 'inc/footer.php';

实例

<?php
if(!isset($_COOKIE['id'])){
    require 'inc/function.php';
    redirect_user();
}


$page_title ='登录成功';

include 'inc/header.php';

echo <<< "WELCOME"
<h2 style="color: aquamarine">
<p>欢迎您：亲爱的{$_COOKIE['name']}</p>
<p><a href="logout.php">退出</a></p>
</h2>
WELCOME;

include 'inc/footer.php';

实例

<?php
if ($_SERVER['REQUEST_METHOD']=='POST'){

    //加载函数库
    require 'inc/function.php';

    //连接数据库
    require 'inc/connect.php';
    //验证登录

   list ($check,$data)=check_login($dbc,$_POST['email'],$_POST['password']);

   if($check){
       setcookie('id',$data['id']);
       setcookie('name',$data['name']);
       //进行跳转
       redirect_user('loggedin.php');
   }else{
       $errors=$data;
   }
    mysqli_close($dbc);

}

include 'login_page.php';

实例

<meta charset="utf-8">

<?php
$page_title='用户登录';
include 'inc/header.php';

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: aquamarine">用户登录</h2>

<form action="login.php" method="post">
    <p>
        <label for="email">邮箱：</label>
        <input type="email" name="email" id="email" value="<?php  echo isset($_POST['email'])? $_POST['email']:'' ?>">
    </p>
    <p>
        <label for="password">密码：</label>
        <input type="password" name="password" id="password" value="<?php  echo isset($_POST['password'])? $_POST['password']:'' ?>">
    </p>
    <p>
        <button type="submit" name="submit" id="submit">登录</button>
    </p>
</form>

<?php
include 'inc/header.php';
?>

实例

<?php
if(!isset($_COOKIE['id'])){
    require 'inc/function.php';
    redirect_user();
}else{
    setcookie('id','',time()-3600);
    setcookie('name','',time()-3600);
}


$page_title ='退出成功';

include 'inc/header.php';

echo <<< "WELCOME"
<h2 style="color: palegreen">
<p>请常回家看看</p>
<p><a href="index.php">返回首页</a></p>
</h2>
WELCOME;

include 'inc/footer.php';

实例

<?php
//连接数据库
$dbc=mysqli_connect('127.0.0.1','root','root','php');

if(mysqli_connect_errno()){
    die('连接失败'.mysqli_connect_errno());
}

实例

<?php
function redirect_user($page='index.php'){

// $_SERVER['HTTP_HOST']; //当前主机名称
//dirname($_SERVER['PHP_SELF']; //当前脚本目录名称

    $url ='http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']);


    //为满足各平台目录分割符号的不统一 删除不一致的右侧斜线
    $url=rtrim($url,'/\\');
    //跳转到制定地址
    $url.='/'.$page;

//跳转到制定地址
    header('Location:'.$url);
    exit();
}
//验证用户登录信息
function check_login($dbc,$email,$password){
    $errors =[];

    if(empty($email)){
        $errors[]='邮箱不能为空';
    }else{
        $e = mysqli_real_escape_string($dbc,trim($email)) ;
    }
    if(empty($password)){
        $errors[]='密码不能为空';
    }else{
        $p = mysqli_real_escape_string($dbc,trim($password));
    }
//从表中进行数据验证
    if(empty($errors)){
        //根据邮箱和密码进行验证，并返回id，name
       $sql ="SELECT `id`,`name` FROM `user` WHERE `email` ='$e' AND `password`=sha1('$p') ";
//       die($sql);
        //执行查询
        $res=mysqli_query($dbc,$sql);
//        var_dump($res);die;  查询结果对象出现
        if(mysqli_num_rows($res)==1) {
//                查询结果解析，解析长量关联部分
            $row = mysqli_fetch_array($res, MYSQLI_ASSOC);
//            print_r($row);die; 打印查询解析结果 确保能得到数据
            //返回结果查询结果
            return [true, $row];
        }else{
            $errors[]='邮箱和密码不正确，请重新输入';
        }

    }
    return[false,$errors];
}