使用PHP实现用户登录和注册的功能

来源：互联网发布：软件功能流程图编辑：程序博客网时间：2024/05/21 12:18

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

<?phpif(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

<?phpif(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>";}?>

使用PHP实现用户登录和注册功能——MySQL数据库文件

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