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+# 作业
+
+```php
+一、
+<?php
+session_start();
+$name = isset($_POST['name'])?$_POST['name']:"";
+$password = isset($_POST['password'])?$_POST['password']:"";
+
+if(!empty($name)){
+    if($name=="白糖" && $password=='260'){
+        $_SESSION['name']= '白糖';
+        setcookie("name","白糖",time()+60*60);
+        echo "登入成功<a href='indext.php'>登入</a>";
+    } else{
+        echo "登入失败";
+    }
+}else {
+
+    ?>
+    <!DOCTYPE html>
+    <html>
+    <head>
+        <meta charset="UTF-8">
+        <title>登入界面</title>
+    </head>
+    <body>
+    <form action="" method="post">
+        用户名:<input type="text" name="name">
+        <br>
+        密码:<input type="password" name="password">
+        <br>
+        <input type="submit">
+
+    </form>
+    </body>
+    </html>
+
+    <?php
+}
+    ?>
+
+
+二、
+<?php
+session_start();
+
+$name =  $_COOKIE['name']?:$_SESSION['name'];
+
+if(empty($name)){
+    echo "你还没有登入，<a href='login.php'>请登入</a>";
+    exit();
+
+}
+include_once('coon.php');
+$sql = "select * from `bookstore1` order by id";
+$rest = mysqli_query($coon,$sql);
+
+?>
+<html>
+<head>
+    <title>图书管理系统——首页</title>
+    <style>
+        #de{
+            width: 440px;
+            height: 300px;
+            /*background-color: aqua;*/
+            margin: 0 auto;
+            padding-left: 80px;
+        }
+    </style>
+</head>
+<body>
+<div id="de">
+    <h1>图书管理系统——首页</h1>
+
+    <table border="1" cellpadding="0" cellspacing="1">
+        <tr><th>书号</th><th>书名</th><th>作者</th><th>出版社</th><th>价格</th><th>操作</th></tr>
+
+        <?php
+
+        if(!mysqli_num_rows($rest)){
+            echo "<tr><td colspan='6' align='center'>暂无数据</td></tr>";
+        }else{
+            while($arr = mysqli_fetch_assoc($rest)) {
+
+
+                ?>
+                <tr>
+                    <td><?php echo $arr['id']?></td>
+                    <td><?php echo $arr['bookname']?></td>
+                    <td><?php echo $arr['bookauthar']?></td>
+                    <td><?php echo $arr['bookaddress']?></td>
+                    <td><?php echo $arr['money']?></td>
+                    <td><a href="update.php?id=<?php echo $arr['id']?>" >编辑</a> | <a href="delete.php?id=<?php echo $arr['id']?>">删除</a></td>
+                </tr>
+
+
+                <?php
+            }
+        };
+        ?>
+        <tr><td colspan="6" align="center"> <a  href="add.php">添加图书</a></td></tr>
+    </table>
+    <a href='logout.php'>退出登入</a>
+
+
+
+</div>
+
+
+
+</body>
+
+</html>
+            
+            
+            
+ 三、        
+ <?php
+session_start();
+unset($_SESSION['name']);
+setcookie("name","",time()-1);
+echo "推出成功<a href= 'login.php'>返回</a>";           
+            
+
+```
+
+# 笔记
+
+````php
+# PHP的会话技术
+
+### 1.判断是否为空值
+
+```php
+empty($变量)//判断是空值
+！empty($变量)//表示此变量不为空值
+```
+
+### 2.cookie(保存到本地电脑)
+
+- 建立cookie
+
+```php
+setcookie("变量名字","变量的值",time()+60*60)//有效期以秒为单位的时间
+```
+
+- 读取cookie
+
+```php
+$自取变量=$_COOKIE['key']//key是对应的变量名字
+    //time()表示当前时间，若想销毁cookie则time()-60
+```
+
+- 改时间格式
+
+```php
+date('Y-m-d H;i:s',$_COOKIE['time的key'])；
+```
+
+### 3.session(保存在浏览器内，浏览器关闭时失效)
+
+- 启动会话
+
+```php
+session_start();
+```
+
+- 注册/赋值
+
+```php
+$_SESSION['key']=值；
+```
+
+- 使用会话
+
+```php
+$自取=$_SESSION['key'];
+```
+
+- 删除会话
+
+  1. 删除单个数据
+
+     ```php
+     unset ($_SESSION['key']);
+     ```
+
+  2. 删除所有数据
+
+     ```php
+     $_SESSION=array();
+     ```
+
+  3. 结束当前会话
+
+     ```php
+     bool session_destroy();
+     ```
+
+
+````
+
+
+
