Description:
------------
I am using register_shutdown_function() toghether with error_get_last() and set_error_handler() to "handle" fatal errors (to display message in debug screen etc, details do not matter).

Everything works perfectly except for one specific scenario - If there is an error caused by calling a method on UNDEFINED (really undefined, not null etc) variable, then the following happens (NOT OK, UNEXPECTED):

 1. registered error_handler is invoked for E_NOTICE (undefined variable) 
 2. the error_handler throws an ErrorException
 3. the exception gets *eaten* by something, it never makes it out of the error_handler
 4. PHP exits with FATAL error (Call to a member function foo() on a non-object)
 5. No shutdown functions get called

----

If the variable is not UNDEFINED but just not an object (e.g. null), everything happens as follows (ALL OK, EXPECTED):

 1. PHP exits with FATAL error (Call to a member function foo() on a non-object)
 2. Registered shutdown functions are called

----

If I return TRUE from the error_handler, following happens (OK, BUT NOT ACCEPTABLE):

 1. registered error_handler is invoked for E_NOTICE (undefined variable) 
 2. the error_handler returns TRUE
 3. PHP exits with FATAL error (Call to a member function foo() on a non-object)
 4. Registered shutdown functions are called

Test script:
---------------
set_error_handler(function($code, $msg, $file = null, $line = null) {
    echo "Error handler called\n";
    throw new \ErrorException($msg, $code, 0, $file, $line);
});

register_shutdown_function(function(){
    echo "Shutting down\n";
    print_r(error_get_last());
});

// $undefined = null; // defined variable does not cause problems
$undefined->foo();

Expected result:
----------------
Fatal error: Call to a member function foo() on a non-object in _example_ on line 14
Shutting down Array ( [type] => 1 [message] => Call to a member function foo() on a non-object [file] => _example_ [line] => 14 ) 

Actual result:
--------------
Error handler called
Fatal error: Call to a member function foo() on a non-object in _example_ on line 13