Error: [$errno] $errstr"; } //set error handler set_error_handler("customError"); function user_db_is_exist() { $PDO = new PDO("" . _FILE_DB_USERINFO_, "", ""); $PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING); $stmt = $PDO->query("SELECT count(*) as co FROM sqlite_master WHERE type=\"table\" AND name = \"user\""); $row = $stmt->fetch(PDO::FETCH_NUM); if ($row) { if ($row[0] > 0) { return true; } else { return false; } } else { return false; } } if (user_db_is_exist()) { if (!isset($_COOKIE["userid"])) { echo "请登陆后执行此操作"; exit; } }