使用PHP实现用户登录和注册的功能
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登陆界面 login.PHP
- <form action="logincheck.php" method="post">
- 用户名:<input type="text" name="username" />
- <br />
- 密码:<input type="password" name="password" />
- <br />
- <input type="submit" name="submit" value="登陆" />
- <a href="register.php">注册</a>
- </form>
登录处理界面 logincheck.php
- <?php
- if(isset($_POST["submit"]) && $_POST["submit"] == "登陆")
- {
- $user = $_POST["username"];
- $psw = $_POST["password"];
- if($user == "" || $psw == "")
- {
- echo "<script>alert(‘请输入用户名或密码!‘); history.go(-1);</script>";
- }
- else
- {
- mysql_connect("localhost","root","sixx");
- mysql_select_db("vt");
- mysql_query("set names ‘gbk‘");
- $sql = "select username,password from user where username = ‘$_POST[username]‘ and password = ‘$_POST[password]‘";
- $result = mysql_query($sql);
- $num = mysql_num_rows($result);
- if($num)
- {
- $row = mysql_fetch_array($result); //将数据以索引方式储存在数组中
- echo $row[0];
- }
- else
- {
- echo "<script>alert(‘用户名或密码不正确!‘);history.go(-1);</script>";
- }
- }
- }
- else
- {
- echo "<script>alert(‘提交未成功!‘); history.go(-1);</script>";
- }
- ?>
注册界面 register.php
- <form action="regcheck.php" method="post">
- 用户名:<input type="text" name="username"/>
- <br/>
- 密 码:<input type="password" name="password"/>
- <br/>
- 确认密码:<input type="password" name="confirm"/>
- <br/>
- <input type="Submit" name="Submit" value="注册"/>
- </form>
注册处理界面 regcheck.php
- <?php
- if(isset($_POST["Submit"]) && $_POST["Submit"] == "注册")
- {
- $user = $_POST["username"];
- $psw = $_POST["password"];
- $psw_confirm = $_POST["confirm"];
- if($user == "" || $psw == "" || $psw_confirm == "")
- {
- echo "<script>alert(‘请确认信息完整性!‘); history.go(-1);</script>";
- }
- else
- {
- if($psw == $psw_confirm)
- {
- mysql_connect("localhost","root","sixx"); //连接数据库
- mysql_select_db("vt"); //选择数据库
- mysql_query("set names ‘gdk‘"); //设定字符集
- $sql = "select username from user where username = ‘$_POST[username]‘"; //SQL语句
- $result = mysql_query($sql); //执行SQL语句
- $num = mysql_num_rows($result); //统计执行结果影响的行数
- if($num) //如果已经存在该用户
- {
- echo "<script>alert(‘用户名已存在‘); history.go(-1);</script>";
- }
- else //不存在当前注册用户名称
- {
- $sql_insert = "insert into user (username,password,phone,address) values(‘$_POST[username]‘,‘$_POST[password]‘,‘‘,‘‘)";
- $res_insert = mysql_query($sql_insert);
- //$num_insert = mysql_num_rows($res_insert);
- if($res_insert)
- {
- echo "<script>alert(‘注册成功!‘); history.go(-1);</script>";
- }
- else
- {
- echo "<script>alert(‘系统繁忙,请稍候!‘); history.go(-1);</script>";
- }
- }
- }
- else
- {
- echo "<script>alert(‘密码不一致!‘); history.go(-1);</script>";
- }
- }
- }
- else
- {
- echo "<script>alert(‘提交未成功!‘); history.go(-1);</script>";
- }
- ?>
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