diff --git a/user_info_api.php b/user_info_api.php
new file mode 100644
index 0000000..b922f6b
--- /dev/null
+++ b/user_info_api.php
@@ -0,0 +1,123 @@
+<?php
+header('Content-Type: application/json; charset=utf-8');
+
+// 允许跨域请求
+header("Access-Control-Allow-Origin: *");
+header("Access-Control-Allow-Methods: GET");
+
+// 数据库连接配置
+$servername = "localhost";
+$username = "a1sax1m9i";
+$password = "a1sax1m9i";
+$dbname = "a1sax1m9i";
+
+// 创建数据库连接
+$conn = new mysqli($servername, $username, $password, $dbname);
+
+// 检查连接
+if ($conn->connect_error) {
+    die(json_encode(array(
+        "success" => false, 
+        "message" => "数据库连接失败: " . $conn->connect_error
+    )));
+}
+
+// 设置数据库连接字符集
+$conn->set_charset("utf8mb4");
+
+/**
+ * 根据用户ID获取用户信息
+ */
+function getUserById($conn) {
+    $userId = $_GET['id'] ?? '';
+    
+    if (empty($userId) || !is_numeric($userId)) {
+        return array(
+            "success" => false,
+            "message" => "请提供有效的用户ID"
+        );
+    }
+    
+    // 修复：移除last_login_at字段引用
+    $sql = "SELECT id, username, email, created_at FROM users WHERE id = ?";
+    $stmt = $conn->prepare($sql);
+    
+    if (!$stmt) {
+        return array(
+            "success" => false,
+            "message" => "查询准备失败: " . $conn->error
+        );
+    }
+    
+    $stmt->bind_param("i", $userId);
+    $stmt->execute();
+    $result = $stmt->get_result();
+    
+    if ($result->num_rows > 0) {
+        $user = $result->fetch_assoc();
+        $stmt->close();
+        
+        return array(
+            "success" => true,
+            "data" => $user
+        );
+    } else {
+        $stmt->close();
+        return array(
+            "success" => false,
+            "message" => "未找到ID为 {$userId} 的用户"
+        );
+    }
+}
+
+/**
+ * 获取所有用户信息
+ */
+function getAllUsers($conn) {
+    // 修复：移除last_login_at字段引用
+    $sql = "SELECT id, username, email, created_at FROM users ORDER BY id ASC";
+    $result = $conn->query($sql);
+    
+    $users = array();
+    if ($result && $result->num_rows > 0) {
+        while ($row = $result->fetch_assoc()) {
+            $users[] = $row;
+        }
+        
+        return array(
+            "success" => true,
+            "count" => count($users),
+            "data" => $users
+        );
+    } else {
+        return array(
+            "success" => false,
+            "message" => "没有找到任何用户信息",
+            "data" => array()
+        );
+    }
+}
+
+// 处理请求
+$action = $_GET['action'] ?? '';
+
+switch ($action) {
+    case 'getUser':
+        $response = getUserById($conn);
+        break;
+    case 'getAllUsers':
+        $response = getAllUsers($conn);
+        break;
+    default:
+        $response = array(
+            "success" => false, 
+            "message" => "请指定正确的操作: action=getUser (需要id参数) 或 action=getAllUsers"
+        );
+}
+
+// 输出JSON响应
+echo json_encode($response, JSON_UNESCAPED_UNICODE);
+
+// 关闭数据库连接
+$conn->close();
+?>