注册、登陆、退出请求分发器实例

注册、登陆、退出请求分发器实例代码

<?php
session_start();
// 后端可接受前端传过来的参数
$name = isset($_POST['username']) ? $_POST['username'] : null;
$pwd = isset($_POST['password']) ? $_POST['password'] : null;
$pwd2 = isset($_POST['password2']) ? $_POST['password2'] : null;

$action = isset($_POST['action']) ? $_POST['action'] : null;
if ($action == ''){
    $action = isset($_GET['action']) ? $_GET['action'] : null;
}

// 1.连接数据库
$config = require_once __DIR__ .DIRECTORY_SEPARATOR .'connect.php';

// var_dump($config);

// pdo预处理接入
// 准备一条预处理sql语句
$sql = "SELECT `username`,`password` FROM `users` WHERE `username`= ?;";

// 准备要执行的语句，并返回语句对象
$stmt = $pdo->prepare($sql);
// 绑定参数到指定的变量名
$para = [$name];

// 执行一条预处理语句
$stmt->execute($para);

$res = $stmt->fetch(PDO::FETCH_ASSOC);

// echo '<pre>';
// print_r($res);
switch ($action){
    case 'login':
        if(empty($res)){
            echo json_encode(array('code'=>2, 'msg'=>'用户名不存在。'));
        }else{
            if(password_verify($pwd, $res['password'])){
                echo json_encode(array('code'=>1, 'msg'=>'登录成功'));
                $_SESSION['username'] = $res['username'];
                return true;
            }else {
                echo json_encode(array('code'=>2, 'msg'=>'用户名或密码不正确。'));
            }
        }
    break;

    case 'register':
        if(!empty($res)){
            echo json_encode(array('code'=>2, 'msg'=>'用户名已存在。'));
        }else{
            if($pwd == $pwd2){
                $pwd = password_hash ($pwd,PASSWORD_DEFAULT );

                $sql = "INSERT INTO `users` (`username`, `password`) VALUES (?, ?);";
                $stmt = $pdo->prepare($sql);
                // 绑定参数到指定的变量名
                $para = [$name,$pwd];

                // 执行一条预处理语句
                $stmt->execute($para);
                $insert_id = $pdo->lastInsertId();

                if($insert_id){
                    echo json_encode(array('code'=>1, 'msg'=>'登录成功'));
                }else {
                    echo json_encode(array('code'=>2, 'msg'=>'用户名或密码不正确。'));}
            }else{
                echo json_encode(array('code'=>2, 'msg'=>'两次输入密码不一致。'));
            };
        };
    break;

    case 'logout':
        session_destroy();
        echo json_encode(array('code'=>1, 'msg'=>'退出成功。'));
    break;
}

演示网址：
[http://help10086.cn/0121/login.php]