教程开始
PHP实现登录注册的三个文件：
index.php (首页)
login.php (登录)
register.php (注册)
相关代码
index.php代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1">
<title>Xnsay - 注册登录</title>
<link rel="stylesheet" type="text/css" href="https://www.layuicdn.com/layui/css/layui.css" />
<script src="https://www.layuicdn.com/layui/layui.js" charset="utf-8"></script>
</head>
<body>
<fieldset class="layui-elem-field layui-field-title" style="margin-top: 20px;">
<legend>Zhe - 登录注册演示</legend> </fieldset>
<div style="padding: 20px; background-color: #F2F2F2;">
<div class="layui-row layui-col-space15">
<div class="layui-col-md6"> <div class="layui-card">
<div class="layui-card-header">注册</div>
<div class="layui-card-body">
<form class="layui-form" action="register.php" method="post" onsubmit="return checkForm(this)" lay-filter="example"> <div class="layui-form-item"> <label class="layui-form-label">输入框</label> <div class="layui-input-block"> <input type="text" name="username" placeholder="请输入账号" class="layui-input"> </div> </div> <div class="layui-form-item"> <label class="layui-form-label">密码框</label> <div class="layui-input-block"> <input type="password" name="password" placeholder="请输入密码" class="layui-input"> </div> </div> <div class="layui-form-item"> <div class="layui-input-block"> <input type="submit" class="layui-btn layui-btn-normal" value="立即注册"/> </div> </div> </form> </div> </div> </div> <div class="layui-col-md6"> <div class="layui-card"> <div class="layui-card-header">登录</div> <div class="layui-card-body"> <form class="layui-form" action="login.php" method="post" onsubmit="return checkForm(this)" lay-filter="example"> <div class="layui-form-item"> <label class="layui-form-label">输入框</label> <div class="layui-input-block"> <input type="text" name="username" placeholder="请输入账号" class="layui-input"> </div> </div> <div class="layui-form-item"> <label class="layui-form-label">密码框</label> <div class="layui-input-block"> <input type="password" name="password" placeholder="请输入密码" class="layui-input"> </div> </div> <div class="layui-form-item"> <div class="layui-input-block"> <input type="submit" class="layui-btn layui-btn-normal" value="立即登录"/> </div> </div> </form> </div> </div> </div> </div> </div> <script type="text/javascript"> // 验证输入不为空的脚本代码 function checkForm(form) { if(form.username.value == "") { alert("用户名不能为空!"); form.username.focus(); return false; } if(form.password.value == "") { alert("密码不能为空!"); form.password.focus(); return false; } return true; } </script> </body> </html>login.php代码：
<?php session_start();
header("content-type:text/html;charset=utf-8"); //连接数据库
$link = mysqli_connect("localhost","pay_com_cn","pay_com_cn","pay_com_cn");
if (!$link) { die("连接失败: " . mysqli_connect_error()); } //接收$_POST用户名和密码 $username = $_POST['username'];
$password = $_POST['password']; //查看表user用户名与密码和传输值是否相等 $sql = "SELECT * FROM user WHERE username = '$username' AND password = '$password'"; //result必需规定由 mysqli_query()、mysqli_store_result() 或 mysqli_use_result() 返回的结果集标识符。
$result = mysqli_query($link,$sql);
$num = mysqli_num_rows($result);//函数返回结果集中行的数量 //判断是否登录后显示或跳转 if($num){ echo '登录成功'; }else{ echo'登录失败'; } mysqli_close($link);//关闭数据库
?>register.php代码：
<?php header("content-type:text/html;charset=utf-8"); //连接数据库 $link = mysqli_connect("localhost","pay_com_cn","pay_com_cn","pay_com_cn");
if (!$link) { die("连接失败: " . mysqli_connect_error()); } //接收$_POST用户名和密码 $username=$_POST['username']; $password=$_POST['password']; //查看表user用户名是否存在或为空 $sql_select = "SELECT * FROM user WHERE username = '$username'"; //result必需规定由 mysqli_query()、mysqli_store_result() 或 mysqli_use_result() 返回的结果集标识符。
$select = mysqli_query($link,$sql_select);
$num = mysqli_num_rows($select);//函数返回结果集中行的数量
if($username == "" || $password == "") { echo "请确认信息完整性"; }else if($num){ echo "已存在用户名";//已存在账户名输出错误 }else{ $sql="insert into user(username,password) values('$username','$password')";$result=mysqli_query($link,$sql); //判断是否注册后显示内容 if(!$result) { echo "注册不成功！"."<br>";//输出错误 echo "<a href='index.php'>返回</a>";//超链接到首页 } else { echo "注册成功!"."<br/>";//输出成功 echo "<a href='index.hphp'>立刻登录</a>";//超链接到首页 } } ?>
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