<?php
namespace?core\lib;
class?model?extends?\PDO{
????public?function?__construct(){
????????$dsn?=?"mysql:host=localhost;dbname=test";
????????$username?=?"root";
????????$password?=?"wrongpw";
????????try{
????????????parent::__construct($dsn,$username,$password);
????????}catch(\PDOExpcetion?$e){
????????????echo?$e->getMessage();
	????}
????}
}

按照老師的代碼，故意將數據庫密碼寫錯，執行時拋出的異常不能被捕獲而報錯，這是為什么呢？PS:密碼不寫錯，則程序運行正常，model類可以正常執行CURD語句。

報錯信息如下：

查資料看著是拋出的pdoexception對象未被捕獲才會這樣報錯。

Fatal?error:?Uncaught?exception?'PDOException'?with?message?'SQLSTATE[HY000]?[1045]?Access?denied?for?user?'root'@'localhost'?(using?password:?YES)'?in?D:\xampp\htdocs\MoocFramework\FW\core\lib\model.php:13?Stack?trace:?#0?D:\xampp\htdocs\MoocFramework\FW\core\lib\model.php(13):?PDO->__construct('mysql:host=loca...',?'root',?'1234561')?#1?D:\xampp\htdocs\MoocFramework\FW\app\ctrl\indexCtrl.php(11):?core\lib\model->__construct()?#2?D:\xampp\htdocs\MoocFramework\FW\core\imooc.php(37):?app\ctrl\indexCtrl->index()?#3?D:\xampp\htdocs\MoocFramework\FW\index.php(30):?core\imooc::run()?#4?{main}?thrown?in?D:\xampp\htdocs\MoocFramework\FW\core\lib\model.php?on?line?13