Fatal error: Uncaught RuntimeException: 数据库连接未初始化：未找到 pdo()。请确认已存在 lib/db.php 并在其中定义 pdo()（返回 PDO）。已尝试路径： - /www/wwwroot/www.yuanma168.com/config_1/../lib/db.php - /www/wwwroot/www.yuanma168.com/config_1/lib/db.php - /www/wwwroot/www.yuanma168.com//lib/db.php in /www/wwwroot/www.yuanma168.com/config_1/functions.php:62 Stack trace: #0 /www/wwwroot/www.yuanma168.com/resource.php(46): db() #1 {main} thrown in /www/wwwroot/www.yuanma168.com/config_1/functions.php on line 62