PHP致命错误：未捕获异常“异常” [英] PHP Fatal error: Uncaught exception 'Exception'

问题描述

我正在玩PHP中的异常。例如，我有一个脚本读取$ _GET请求并加载一个文件;如果文件不存在，应该抛出一个新的异常：

  if（file_exists（$ _SERVER ['DOCUMENT_ROOT'] 。'/'。$ _ GET ['image']））{
 //这里真的很奇怪。 
} 
 else {
 throw new Exception（请求的文件不存在）; 
} 
  

问题是，当我尝试提供一个不存在的文件测试，我有一个500错误，而不是异常消息。服务器日志如下：

  [09-Jul-2013 18:26:16 UTC] PHP致命错误：未捕获的异常异常与消息'请求的文件不存在'在C：\sites\wonderfulproject\script.php：40 
堆栈跟踪：
＃0 {主} 
扔在C：\sites\wonderfulproject\script.php行40 
  

我想知道我在这里缺少一些真正的东西。

我已经检查了这个问题 PHP致命错误：未捕获异常异常与消息，但它不像我的问题，没有简明扼要的答案。

帮助？

*编辑*

似乎这是与 throw 关键字相关的内容。例如，如果我使用 echo ，我会在屏幕上显示消息，如下所示：

exception '在C：\sites\wonderfulproject\script.php：183堆栈跟踪：＃0 {main}

消息'该文件不存在'为什么是这样？

**编辑2 **

感谢@Orangepill，我有了更好的了解关于如何处理异常。我从nettuts找到了一个很棒的tut，帮助了很多。链接： http：// net。 tutsplus.com/tutorials/php/the-ins-and-outs-of-php-exceptions/

解决方案

这是display_errors关闭的未捕获异常的预期行为。

您的选项是通过php或ini文件打开display_errors或捕获并输出异常。

  ini_set（display_errors，1）; 
  

或

  try {
 //可能抛出异常的代码
} catch（异常$ e）{
 echo $ e-> getMessage（）; 
} 
  

如果你抛出异常，意图是，将抓住并处理它。如果不是，则是服务器错误（500）。

另一个选项是使用 set_exception_handler 设置脚本的默认错误处理程序。

  function default_exception_handler（Exception $ e）{
 //向用户显示某些内容，让他们知道我们跌倒
 echo< h2>发生不良事件< / h2>; 
 echo< p>我们填写查找负责人并让他们拍摄< / p>; 
 //为异常做一些日志记录，并调用kill_programmer函数。 
} 
 set_exception_handler（default_exception_handler）; 
  

I'm playing around with exceptions in PHP. For example, I have a script that reads a $_GET request and loads a file; If the file doesn't exists, an new exception should be thrown:

if ( file_exists( $_SERVER['DOCUMENT_ROOT'] .'/'.$_GET['image'] ) ) {
    // Something real amazing happens here.
}
else {
    throw new Exception("The requested file does not exists.");
}

The problem is that, when I try to supply an non existent file for the test, I got a 500 error instead of the exception message. The server log is the following:

[09-Jul-2013 18:26:16 UTC] PHP Fatal error:  Uncaught exception 'Exception' with message 'The requested file does not exists.' in C:\sites\wonderfulproject\script.php:40
Stack trace:
#0 {main}
  thrown in C:\sites\wonderfulproject\script.php on line 40

I wonder if I'm missing something real obvious here.

I've checked this question PHP fatal error: Uncaught exception 'Exception' with message but it's not quite like my issue, and have no concise answer.

Help, please?

* EDIT *

It seems this is something related to the throw keyword. If I use echo for example, I got the message printed on the screen, like this:

exception 'Exception' with message 'The file does not exists.' in C:\sites\wonderfulproject\script.php:183 Stack trace: #0 {main}

Why is that?

** EDIT 2 **

Thanks to @Orangepill, I got a better understanding about how to handle exceptions. And I found a superb tut from nettuts that helped a lot. The link: http://net.tutsplus.com/tutorials/php/the-ins-and-outs-of-php-exceptions/

解决方案

This is expected behavior for an uncaught exception with display_errors off.

Your options here are to turn on display_errors via php or in the ini file or catch and output the exception.

 ini_set("display_errors", 1);

or

 try{
     // code that may throw an exception
 } catch(Exception $e){
     echo $e->getMessage();
 }

If you are throwing exceptions, the intention is that somewhere further down the line something will catch and deal with it. If not it is a server error (500).

Another option for you would be to use set_exception_handler to set a default error handler for your script.

 function default_exception_handler(Exception $e){
          // show something to the user letting them know we fell down
          echo "<h2>Something Bad Happened</h2>";
          echo "<p>We fill find the person responsible and have them shot</p>";
          // do some logging for the exception and call the kill_programmer function.
 }
 set_exception_handler("default_exception_handler");

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