php login example [PHP 登入檢查機制]

資料來源: Bard

01.登入表单：

<form action="login.php" method="post">
  <label for="username">用户名：</label>
  <input type="text" id="username" name="username" required>
  <br>
  <label for="password">密码：</label>
  <input type="password" id="password" name="password" required>
  <br>
  <button type="submit">登入</button>
</form>

02.驗證程序：

<?php
session_start();

if ($_SERVER["REQUEST_METHOD"] === "POST") {
  $username = $_POST["username"];
  $password = $_POST["password"];

  // 验证用户名和密码（例如查询数据库）
  if (// 验证通过) {
    $_SESSION["logged_in"] = true;
    $_SESSION["username"] = $username;
    header("Location: protected_page.php");
  } else {
    echo "登入失败，请重试";
  }
}
?>

03.管控葉面：

<?php
session_start();

if (!isset($_SESSION["logged_in"])) {
  header("Location: login.php");
  exit;
}

// 访问受保护的内容
echo "欢迎，" . $_SESSION["username"];
?>