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+```php
+<?php
+error_reporting(E_ALL^E_WARNING);//隐藏warning的错误警告
+error_reporting(E_ALL^E_NOTICE);
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','qianshou');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+//查询uesr表的全部信息
+$sql="select * from `user` order by id";
+//执行上面的语句，返回一个结果集
+$res =mysqli_query($conn,$sql);
+//启动session
+session_start();
+$user = $_SESSION['username'];
+if(!isset($user)){
+
+    echo "没有登陆&nbsp;&nbsp;&nbsp;&nbsp;<a href='login.php'>登陆</a>";
+
+
+
+
+}
+```
+
+```php+HTML
+<?php
+error_reporting(E_ALL^E_WARNING);//隐藏warning的错误警告
+error_reporting(E_ALL^E_NOTICE);
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','qianshou');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+//查询uesr表的全部信息
+$sql="select * from `user` order by id";
+//执行上面的语句，返回一个结果集
+$res =mysqli_query($conn,$sql);
+//启动session
+session_start();
+$user = $_SESSION['username'];
+//查询uesr表的全部信息
+$sql="select * from `user` order by id";
+//执行上面的语句，返回一个结果集
+$res =mysqli_query($conn,$sql);
+echo "用户：".$user."  登陆成功";
+echo "<a href='logout.php'>注销</a>";
+?>
+
+
+    <html>
+    <head>
+        <meta charset="utf-8">
+        <title>qianshou</title>
+    </head>
+    <bord>
+        <h1 align="center">qianshou主页</h1>
+        <table border="1" width="1000" align="center">
+            <tr align="center">
+                <th>用户编号</th>
+                <th>用户名</th>
+                <th>密码</th>
+                <th>性别</th>
+                <th>身高</th>
+                <th>爱好</th>
+                <th>年龄</th>
+                <th>住址</th>
+                <th>电话</th>
+                <th>交友宣言</th>
+            </tr>
+            <?php
+            //判断上面返回的结果集是否有数据
+            if(!mysqli_num_rows($res)){//结果集为空执行下面语句
+                echo "<tr align='center'><td colspan='10'>没有数据</td></tr>";
+            }else{//否则把结果集转变为关联数组循环输出
+                while($a = mysqli_fetch_assoc($res)){
+                    ?>
+                    <tr align="center">
+                        <td><?php echo $a['id']; ?></td>
+                        <td><?php echo $a['username']; ?></td>
+                        <td><?php echo $a['password']; ?></td>
+                        <td><?php echo $a['sex']; ?></td>
+                        <td><?php echo $a['height']; ?></td>
+                        <td><?php echo $a['hobby']; ?></td>
+                        <td><?php echo $a['age']; ?></td>
+                        <td><?php echo $a['address']; ?></td>
+                        <td><?php echo $a['phone']; ?></td>
+                        <td><?php echo $a['aboutme']; ?></td>
+                    </tr>
+
+                    <?php
+                }
+            }
+            ?>
+        </table>
+    </bord>
+
+    </html>
+
+```
+
+```php+HTML
+<?php
+error_reporting(E_ALL^E_NOTICE);
+error_reporting(E_ALL^E_WARNING);
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','qianshou');
+//设置字符集
+session_start();
+mysqli_query($conn,"set names utf8");
+if(empty($_POST['username'])){
+?>
+<!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>用户登录</title>
+</head>
+<body>
+<h1>用户登录</h1>
+<form action="" method="post">
+    <table>
+        <tr><th>用户名：</th><td><input type="text" name="username" ></td></tr>
+        <tr><th>密码：</th><td><input type="password" name="password" ></td></tr>
+        <tr><td colspan="2"><input type="submit" value="登录"></td></tr>
+
+    </table>
+</form>
+<p>没有注册用户？<a href="register.php">现在去</a></p>
+</body>
+</html>
+    <?php
+} else{
+    $username = $_POST['username'];
+    $password = $_POST['password'];
+    // 连数据库服务器
+    include_once ('./conn.php');
+
+    // SQL
+    $sql = "select * from `user` where `username`='$username' and `password`='$password'";
+
+    // query
+    $rest = mysqli_query($conn,$sql);
+    // 直接判断这个结果集的行数是不是大于0
+    if(mysqli_num_rows($rest)<=0){
+        die("用户名或密码错误！<a href=''>重新登录！</a>");
+    }
+
+    echo "登录成功！<a href='index2.php'>返回主页</a>";
+
+}
+?>
+```
+
+```php
+<?php
+// 注销功能，就是删除session对应的值
+session_start();
+unset($_SESSION['username']);
+setcookie('username','',time()-1);
+echo "注销成功";
+```
+
+```php+HTML
+<?php
+?>
+<!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>用户注册</title>
+    <script>
+        function check(){
+
+
+
+
+            if(  myform.username.value=='' ||
+                myform.password1.value==''  ||
+                myform.password2.value==''  ||
+                myform.sex.value==''  ||
+                myform.age.value==''  ||
+                myform.height.value==''  ||
+                myform.phone.value==''
+            ){
+                alert("*号为必填项！")
+                return false;
+            }
+
+
+
+
+
+            if(myform.password1.value!=myform.password2.value){
+                alert("密码验证错误！")
+                return false;
+            }
+
+            // 先获取爱好选项的标签
+            var hobbys = document.getElementsByName("hobby[]");
+            //标记是否选中，默认未选中
+            var flag = false ;
+            // 遍历标签，判断是否有checked，只要找到一个就标记true，并中断循环
+            for(var i=0;i<hobbys.length;i++){
+                if(hobbys[i].checked){
+                    flag = true;
+                    break ;
+                }
+
+            }
+            // 最终根据标记来判断是否选了爱好，
+            if(!flag){
+                alert("爱好至少选一项！");
+                return false;
+            }
+
+
+        }
+    </script>
+</head>
+<body>
+<h1 align="center">用户注册</h1>
+<form action="register_do.php" method="post" enctype="multipart/form-data" id="myform">
+    <table border="1" width="500" align="center">
+        <tr><th>用户名：</th><td><input type="text" name="username"  >*</td></tr>
+        <tr><th>密码：</th><td><input type="password" name="password1" >*</td></tr>
+        <tr><th>再次密码：</th><td><input type="password" name="password2" >*</td></tr>
+        <tr><th>性别：</th><td><input type="radio" name="sex" value="1">男 <input type="radio" name="sex" value="0">女 *</td></tr>
+        <tr><th>年龄：</th><td><input type="text" name="age" >*</td></tr>
+        <tr><th>身高：</th><td><input type="text" name="height" >*</td></tr>
+        <tr><th>爱好：</th>
+            <td>
+                <input type="checkbox" name="hobby[]" value="运动" class="hobby">运动
+                <input type="checkbox" name="hobby[]" value="音乐" class="hobby">音乐
+                <input type="checkbox" name="hobby[]" value="电影" class="hobby">电影
+                <input type="checkbox" name="hobby[]" value="旅游" class="hobby">旅游
+                <input type="checkbox" name="hobby[]" value="美食" class="hobby">美食
+                <input type="checkbox" name="hobby[]" value="游戏" class="hobby">游戏
+                <input type="checkbox" name="hobby[]" value="绘画" class="hobby">绘画
+                *
+            </td>
+        </tr>
+        <tr><th>手机号码：</th><td><input type="text" name="phone">*</td></tr>
+        <tr><th>住址：</th><td><input type="text" name="address"></td></tr>
+        <tr><th>交友宣言：</th><td><input type="text" name="aboutme"></td></tr>
+
+
+        <tr><td colspan="2" align="center"><input type="submit" name="提交" onclick="return check()"></td></tr>
+
+
+    </table>
+</form>
+</body>
+</html>
+
+
+```
+
+```php
+<?php
+// 接收 表单过来的数据
+
+
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','qianshou');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+
+foreach ($_POST as $key => $value){
+    if($key!='提交'){
+        $$key=$value;
+    }
+}
+$hobby = implode(',',$hobby);
+
+
+
+
+
+// 编写SQL语句 注册其实是往数据库表里新增数据 insert
+$sql = "insert into `user` value (null,'$username','$password1',$sex,'$height','$hobby','$age','$address','$phone','$aboutme')";
+//echo $sql;
+// 执行上面的SQL语句
+$result = mysqli_query($conn,$sql);
+// 判断
+if($result){
+    echo "注册成功。<a href='login.php'>请登录！</a>";
+}else{
+    die("注册失败。".mysqli_error($conn));
+}
+
+
+// 接文件
+//var_dump($_FILES);
+```
+

用户名：	*
密码：	*
再次密码：	*
性别：	男女 *
年龄：	*
身高：	*
爱好：	+ 运动 + 音乐 + 电影 + 旅游 + 美食 + 游戏 + 绘画 + * +
手机号码：	*
住址：
交友宣言：