Home > Backend Development > PHP Tutorial > php Try Catch多层级错误测试

php Try Catch多层级错误测试

WBOY
Release: 2016-06-13 11:54:12
Original
967 people have browsed it

php Try Catch多层级异常测试

<?phpclass a { public function a1 () {  try {   throw new Exception('123');  } catch (Exception $e) {   throw $e;  } }}class b { public function b1 () {  try {   $a = new a();   $a->a1();  } catch (Exception $e) {   throw $e;   //throw new Exception($e->getMessage());  } }}class c { public function c1 () {  try {   $a = new b();   $a->b1();  } catch (Exception $e) {   throw $e;  } }}try { $c = new c();  $c->c1();} catch (Exception $e) { echo $e->getTraceAsString();}echo 'end';?>
Copy after login

页面try catch里使用c的 c1,c1里使用b的b1,b1里使用a的a1。

默认的是:a1里抛出异常,b1里捕获a1的异常,然后再把刚才的异常抛出,c1捕获,然后抛出,最后页面捕获并输出。
结果是:
X-Powered-By: PHP/5.1.1
Content-type: text/html

#0 D:\workspace\myzCollection\test.php(16): a->a1()
#1 D:\workspace\myzCollection\test.php(28): b->b1()
#2 D:\workspace\myzCollection\test.php(37): c->c1()
#3 C:\Program Files\Zend\ZendStudio-5.2.0\bin\php5\dummy.php(1): include('D:\workspace\my...')
#4 {main}end


 

第二个测试:
把b1里面的throw $e去掉,就是不抛出。
结果是:
X-Powered-By: PHP/5.1.1
Content-type: text/html

end


 

第三个测试:
把b1里面的throw new Exception($e->getMessage());打开。
抛出一个新的异常,这样b1以上的调用都拿不到a1的异常了。
结果是:
X-Powered-By: PHP/5.1.1
Content-type: text/html

#0 D:\workspace\myzCollection\test.php(28): b->b1()
#1 D:\workspace\myzCollection\test.php(37): c->c1()
#2 C:\Program Files\Zend\ZendStudio-5.2.0\bin\php5\dummy.php(1): include('D:\workspace\my...')
#3 {main}end


 

第四个测试:
把b1里面的try catch throw都去掉。
结果:仍然输出原来的异常,就是说中间的步骤不需要抛出,最上层也能拿到最下层抛出的异常。
只是有一个问题,b中如果出先异常,就没有办法取到,如果需要也检测b的话,那么也要在b中加上try catch

X-Powered-By: PHP/5.1.1
Content-type: text/html

#0 D:\workspace\myzCollection\test.php(16): a->a1()
#1 D:\workspace\myzCollection\test.php(28): b->b1()
#2 D:\workspace\myzCollection\test.php(37): c->c1()
#3 C:\Program Files\Zend\ZendStudio-5.2.0\bin\php5\dummy.php(1): include('D:\workspace\my...')
#4 {main}end

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template