数据库连接：
实例
<?php
$db = [
'type' => 'mysql',
'host' => 'localhost',
'dbname' => 'localhost',
'username' => 'wenbin0209',
'password' => 'a384309596',
'port' => 3306
];
$dsn = "{$db['type']}:host={$db['host']};dbname={$db['dbname']}";
try {
$pdo = new PDO($dsn,$db['username'],$db['password']);
} catch(PDOException $e){
die('错误信息:'.$e->getMessage());
}
// echo '请求成功';
?>运行实例 »
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转发器：
实例
<?php
session_start();
$action = isset($_GET['action']) ? $_GET['action'] : 'login';
$action = htmlentities(strtolower(trim($action)));
// print_r($action);
switch($action){
case 'login';
include __DIR__.'/login.php';
break;
case 'index';
include __DIR__.'/index.php';
break;
case 'check';
include __DIR__.'/check.php';
break;
case 'logout':
include __DIR__ . '/logout.php';
break;
default:
header('Location: index.php');
echo '<script>location.assign("index.php");</script>';
}运行实例 »
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首页：
实例
<?php
// 首页判断是否登录
if(isset($_SESSION['username'])){
echo '欢迎'.$_SESSION['username'].'登录';
echo '<a href="dispatch.php?action=logout">退出</a>';
}else {
echo '<a href="dispatch.php?action=login">请登录</a>';
}运行实例 »
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检查用户登录：
实例
<?php
// echo $_GET['username'];
// echo $_GET['password'];
// echo 11111;
require('db.php');
if(isset($_POST['username']) && isset($_POST['password'])) {
// print_r($_POST['username']);
$username = $_POST['username'];
$password = $_POST['password'];
// 1.先查询登录账号和密码
$sql = 'SELECT * from `ls_admin` where `username` = :username AND `password` = :password';
$stmt = $pdo->prepare($sql);
$stmt->execute(['username' => $username,'password'=> $password]);
$user = $stmt->fetch(PDO::FETCH_ASSOC);
// print_r($user);
// exit;
if(empty($user))
{
echo '未找到该用户';
}else{
$_SESSION['username'] = $user['username'];
echo '<script>alert("登录成功");location.assign("dispatch.php?action=index");</script>';
exit;
}
// print_r($user);
}else {
echo '请填写账号或密码';
}运行实例 »
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登录：
实例
<?php echo '请登录'; ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <form action="dispatch.php?action=check" method="post"> <p> <label for="model">用户名:</label> <input type="text" name="username" id='model'> </p> <p> <label for="pasd">密码:</label> <input type="text" name="password" id='pasd'> </p> <button>登录</button> </form> </body> </html>
运行实例 »
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退出登录：
实例
<?php
//退出登录
if(isset($_SESSION['username'])){
session_destroy();
echo '退出成功';
}else{
echo '<a href="dispatch.php?action=login">请登录</a>';
}运行实例 »
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PDO练习：
实例
<?php
// 连接数据库
require('db.php');
//-----------查询数据----------
//查询数据
$sql = 'SELECT id,username,nickname from `ls_admin`';
$stmt = $pdo->prepare($sql);
$select = $stmt->execute();
// 通过列号绑定
$stmt -> bindColumn(1,$id);
// 通过列名绑定
$stmt->bindColumn('username', $name);
$stmt->bindColumn('nickname', $nickname);
// 返回数据
while($stmt->fetch(PDO::FETCH_ASSOC)){
$data = 'id:'.$id . "\t" . '用户名:'.$name . "\t" . '昵称:'.$nickname . "\n";
echo'<hr>';
print $data;
}运行实例 »
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手写：
