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安順PHP研習範例
=========

```

<?php
//引入檔案（設定）
session_start();
require_once "config.php";
require_once 'function.php';
require_once 'smarty/libs/Smarty.class.php';
//實體化
$smarty = new Smarty;
//連線資料庫
$db = link_db();
// die(var_dump($smarty));

//變數過濾或預設直
$name    = isset($_SESSION['name']) ? htmlspecialchars($_SESSION['name'], ENT_QUOTES) : '訪客';
$group   = isset($_SESSION['group']) ? $_SESSION['group'] : '';
$op      = isset($_REQUEST['op']) ? htmlspecialchars($_REQUEST['op'], ENT_QUOTES) : '';
$content = '';

//跑流程
switch ($op) {
    case 'login':
        login();
        header("location: index.php");
        exit;

case 'logout':
        logout();
        header("location: index.php");
        exit;

// case 'regist':
    // regist();
    // break;

case 'save_regist':
        save_regist();
        header("location: index.php");
        exit;

default:
        # code...
        break;
}

//函數區

//登入
function login()
{
    global $admin_id, $admin_pass;
    $name = isset($_POST['name']) ? $_POST['name'] : '';
    if ($admin_id == $name and $admin_pass == $_POST['pass']) {
        $_SESSION['group'] = "admin";
        $_SESSION['name']  = $name;
        return true;
    } elseif ($user_id == $name and $user_pass == $_POST['pass']) {
        $_SESSION['group'] = "user";
        $_SESSION['name']  = $name;
        return true;
    }
    return false;
}

//登出
function logout()
{
    unset($_SESSION['group']);
    unset($_SESSION['name']);
}

//新增使用者
function save_regist()
{
    global $db, $admin_id;
    $name = $db->real_escape_string($_POST['name']);
    if (empty($name)) {
        die("姓名為必填！");
    }

$email = $db->real_escape_string($_POST['email']);
    if (empty($email)) {
        die("Eamil為必填！");
    }
    $email = filter_var($email, FILTER_VALIDATE_EMAIL);
    if (!$email) {
        die("不合法的Email");
    }

$pass = $db->real_escape_string($_POST['pass']);
    if (empty($pass)) {
        die("密碼為必填！");
    }
    $pass = password_hash($pass, PASSWORD_DEFAULT);

$group = ($admin_id == $email) ? 'admin' : 'user';

$sql = "INSERT INTO `users` (`name`, `email`, `pass`, `group`) VALUES('{$name}', '{$email}','{$pass}','{$group}')";
    $db->query($sql) or die($db->error);
    $uid = $db->insert_id;
    return $uid;
}

//結果送至樣板
$smarty->assign('my_name', $name);
$smarty->assign('group', $group);
$smarty->assign('page_title', '活動報名系統');
$smarty->assign('content', $content);
$smarty->assign('op', $op);
$smarty->display('index.tpl');
```

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