init

includes/functions.php

@@ -0,0 +1,51 @@
+<?php
+// 通用函数
+
+/**
+ * 获取配置值
+ */
+function getConfig($key, $default = '') {
+    global $db;
+    $stmt = $db->prepare("SELECT value FROM config WHERE key = ?");
+    $stmt->execute([$key]);
+    $result = $stmt->fetch(PDO::FETCH_ASSOC);
+    return $result ? $result['value'] : $default;
+}
+
+/**
+ * 更新配置值
+ */
+function updateConfig($key, $value) {
+    global $db;
+    $stmt = $db->prepare("INSERT OR REPLACE INTO config (key, value) VALUES (?, ?)");
+    return $stmt->execute([$key, $value]);
+}
+
+/**
+ * 格式化文件大小
+ */
+function formatFileSize($bytes) {
+    if ($bytes >= 1073741824) {
+        return number_format($bytes / 1073741824, 2) . ' GB';
+    } elseif ($bytes >= 1048576) {
+        return number_format($bytes / 1048576, 2) . ' MB';
+    } elseif ($bytes >= 1024) {
+        return number_format($bytes / 1024, 2) . ' KB';
+    } else {
+        return $bytes . ' B';
+    }
+}
+
+/**
+ * 检查是否已登录
+ */
+function isLoggedIn() {
+    return isset($_SESSION['admin_logged_in']) && $_SESSION['admin_logged_in'] === true;
+}
+
+/**
+ * 安全输出 HTML
+ */
+function e($string) {
+    return htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
+}