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php Try Catch异常测试_PHP

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Release: 2016-06-01 12:23:38
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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:一切正常,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

 

class 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 789;

?>

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