Trying to use a global exception handler in PHP to handle various toplevel exceptions in a unified manner

Please consider the following code:

<?php

class MyException extends Exception {}

function global_exception_handler($exception)
{
    switch (get_class($exception)) {
    case 'MyException':
        print "I am being handled in a unified way.\n";
        break;
    default:
        $backtrace = debug_backtrace();
        $exception_trace_object = $backtrace[0]['args'][0];
        var_dump($exception_trace_object);
        print "----\n";
        $reflected_exception_trace_object = new ReflectionObject($exception_trace_object);
        $reflected_trace_property = $reflected_exception_trace_object->getProperty('trace');
        $reflected_trace_property->setAccessible(true);
        var_dump($reflected_trace_property);
        print "----\n";

        // NOT WORKING, I STUCK HERE.
        var_dump($reflected_trace_property->getValue($reflected_trace_property));

        throw $exception;
    }
}

set_exception_handler('global_exception_handler');

function function1()
{
    function2();
}

function function2()
{
    function3();
}

function function3()
{
    throw new Exception();
}

function1();

?>

What I'm trying to do is handling various types of exceptions in a unified way across various files by simply setting up a global exception handler without having to write any boilerplate code (except the header and footer includes which are present in 开发者_高级运维every file).

The problem is that when the thrown exception type is not handled by the global exception handler and I want to rethrow the exception, the stack trace gets lost which is a limitation of using set_exception_handler().

I can retrieve the stack trace by using debug_backtrace() but I cannot access its relevant private members to be able to print it appropriately.

This is what the above script produces:

object(Exception)#1 (7) {
  ["message":protected]=>
  string(0) ""
  ["string":"Exception":private]=>
  string(0) ""
  ["code":protected]=>
  int(0)
  ["file":protected]=>
  string(28) "/home/laci/download/test.php"
  ["line":protected]=>
  int(42)
  ["trace":"Exception":private]=>
  array(3) {
    [0]=>
    array(4) {
      ["file"]=>
      string(28) "/home/laci/download/test.php"
      ["line"]=>
      int(37)
      ["function"]=>
      string(9) "function3"
      ["args"]=>
      array(0) {
      }
    }
    [1]=>
    array(4) {
      ["file"]=>
      string(28) "/home/laci/download/test.php"
      ["line"]=>
      int(32)
      ["function"]=>
      string(9) "function2"
      ["args"]=>
      array(0) {
      }
    }
    [2]=>
    array(4) {
      ["file"]=>
      string(28) "/home/laci/download/test.php"
      ["line"]=>
      int(45)
      ["function"]=>
      string(9) "function1"
      ["args"]=>
      array(0) {
      }
    }
  }
  ["previous":"Exception":private]=>
  NULL
}
----
object(ReflectionProperty)#3 (2) {
  ["name"]=>
  string(5) "trace"
  ["class"]=>
  string(9) "Exception"
}
----
NULL

Fatal error: Exception thrown without a stack frame in Unknown on line 0

Thanks in advance!

Check the comments on http://php.net/manual/de/function.set-exception-handler.php there are several similar issues and solutions there. For your code I see two possible solutions:

Change your code into

function global_exception_handler($exception = NULL)

or add a description to

throw new Exception('Testing here...');