基于PHP+MySQL实现注册和登录功能
总述
通过 PHP 连接 MySQL 数据库需要有以下关键的五个步骤
- 连接数据库
- 创建数据表
- 插入数据
- 获取数据
- 结束连接
而基于这五个步骤，即可实现简易的登录注册功能
| 首页 | 登录成功页面 |
|---|---|
 |
 |
├── conn.php
├── index.html
├── login.php
├── reg.php
└── result.php
index.html为首页
result.php为结果页
conn.php为连接数据库
reg.php和login.php分别处理注册和登录的业务逻辑
关键步骤
连接数据库
$host='your-hostname';//域名
$dbUser='your-database-username';//数据库用户名
$dbPassword='your-database-user-password';//数据库用户密码
$dbName='your-database-name';//数据库名
// 创建连接
$conn = new mysqli($host, $dbUser, $dbPassword, $dbName);
// 检测连接
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
echo "连接成功";
创建数据表
//使用 sql 创建数据表 User
$sql = "CREATE TABLE User (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(30) NOT NULL,
password VARCHAR(30) NOT NULL
)";
if ($conn->query($sql) === TRUE) {
echo "Table MyGuests created successfully";
} else {
echo "创建数据表错误: " . $conn->error;
}
插入数据
$sql = "INSERT INTO User (username, password)
VALUES ('test', '123456')";
if ($conn->query($sql) === TRUE) {
echo "新记录插入成功";
} else {
echo "Error: " . $sql . "
" . $conn->error;
}
获取数据
$sql = "SELECT username, password FROM User";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
echo "用户名: " . $row["username"]. " - 密码: " . $row["password"]. "
";
}
} else {
echo "0 结果";
}
结束连接
$conn->close();
系统代码
index.html
<html>
<head>
<meta charset="utf-8">
head>
<body>
<h1>登录注册系统h1>
<form action="result.php" method="post">
<table>
<tr>
<td>请输入你的用户名td>
<td><input type="text" name="username">td>
tr>
<tr>
<td>请输入你的密码td>
<td><input type="text" name="password">td>
tr>
<tr>
<td colspan="2">
<input type="submit" name="login" value="登录">
<input type="submit" name="reg" value="注册">
<td>
tr>
table>
form>
body>
html>
result.php
include('conn.php');
$sql = "SELECT username, password FROM User";
$result = $conn->query($sql);
$final = 0;
if(!empty($_REQUEST['login'])){
include("login.php");
}
else if(!empty($_REQUEST['reg'])){
include("reg.php");
}
switch ($final) {
case 0:
echo " 初始结果 " . "
";
break;
case 1:
echo " 用户名或密码不能为空！ " . "
";
break;
case 2:
echo " 登录成功 " . "
";
break;
case 3:
echo " 密码错误 " . "
";
break;
case 4:
echo " 不存在此用户 " . "
";
break;
case 5:
echo " 此用户名已存在 " . "
";
break;
case 6:
echo " 注册成功 " . "
";
break;
case 7:
echo "Error: " . $sql . "
" . $conn->error. "
";
break;
default:
echo " 默认结果 " . "
";
break;
}
?>
login.php
$arg1=$_REQUEST['username'];
$arg2=$_REQUEST['password'];
$flag=0;
if($arg1=="" || $arg2==""){
$final =1;
// echo " 用户名或密码不能为空！ " . "
";
}
else if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
if($arg1==$row["username"]){
$flag=1;
if($arg2==$row["password"])
$final =2;
// echo " 登录成功 " . "
";
else
$final =3;
// echo " 密码错误 " . "
";
break;
}
}
if(!$flag)
$final =4;
// echo " 不存在此用户 " . "
";
} else {
$final =4;
// echo " 不存在此用户 " . "
";
}
?>
reg.php
$arg1=$_REQUEST['username'];
$arg2=$_REQUEST['password'];
$flag=0;
if($arg1=="" || $arg2==""){
$flag=1;
$final =1;
// echo " 用户名或密码不能为空！ " . "
";
}
else if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
if($arg1==$row["username"]){
$final=5;
// echo " 此用户名已存在 " . "
";
break;
}
}
}
if(!$flag){
$sql = "INSERT INTO User (username, password)
VALUES ('" . $arg1 . "','" . $arg2 . "')";
// echo $sql;
if ($conn->query($sql) === TRUE) {
$final=6;
// echo " 注册成功 " . "
";
} else {
$final=7;
// echo "Error: " . $sql . "
" . $conn->error;
}
}
?>
conn.php
$host='your-hostname';//域名
$dbUser='your-database-username';//数据库用户名
$dbPassword='your-database-user-password';//数据库用户密码
$dbName='your-database-name';//数据库名
// 创建连接
$conn = new mysqli($host, $user, $password, $dbName);
echo "正在尝试连接 ".$dbName." 数据库" . "
";
// 检测连接
if ($conn->connect_error) {
die("连接数据库失败: " . $conn->connect_error . "
");
}
echo "连接数据库成功" . "
";
?>