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Bug #48622 Invalid error reporting with __toString() method
Submitted: 2009-06-20 22:03 UTC Modified: 2016-07-14 11:12 UTC
Votes:16
Avg. Score:4.6 ± 0.6
Reproduced:13 of 14 (92.9%)
Same Version:6 (46.2%)
Same OS:7 (53.8%)
From: woody dot gilk at kohanaphp dot com Assigned: dmitry (profile)
Status: Assigned Package: Scripting Engine problem
PHP Version: 5.2.10 OS: Mac OSX 10.5
Private report: No CVE-ID: None
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From: woody dot gilk at kohanaphp dot com
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 [2009-06-20 22:03 UTC] woody dot gilk at kohanaphp dot com
Description:
------------
When using a custom error handler, it is possible to make PHP trigger an 
E_FATAL by concatenating an object with a __toString() method together 
with a variable that is not set.

Tested in 5.2.9 and 5.2.10.

Reproduce code:
---------------
<?php

class test {

	public static function error_handler($code, $error, $file = NULL, $line = NULL)
	{
		// This error is not suppressed by current error reporting settings
		throw new ErrorException($error, $code, 0, $file, $line);
	}

	public static function run()
	{
		$object = new self;

		echo $object.$foo;
	}

	public function __toString()
	{
		return __CLASS__;
	}

}

error_reporting(E_ALL);

set_error_handler(array('test', 'error_handler'));

test::run();

Expected result:
----------------
PHP Fatal error:  Uncaught exception 'ErrorException' with message 
'Undefined variable: foo' in php_bug.php:15
Stack trace:
#0 php_bug.php(15): test::error_handler()
#1 php_bug.php(29): test::run()
#2 {main}
  thrown in php_bug.php on line 15

Actual result:
--------------
PHP Fatal error:  Method test::__toString() must not throw an exception 
in

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 [2009-06-20 22:05 UTC] woody dot gilk at gmail dot com
Here is a copy of the test script: http://gist.github.com/133305
 [2009-06-22 19:18 UTC] woody dot gilk at kohanaphp dot com
To add a little more information here, I should be able to do this:

try
{
    echo $object.$foo;
}
catch (ErrorException $e)
{
    // Trap the E_NOTICE from $foo being undefined
    echo 'error occurred';
}

However, because an E_FATAL is incorrectly triggered, it is impossible 
to do so.
 [2016-07-14 11:12 UTC] dmitry@php.net
-Status: Open +Status: Assigned -Assigned To: +Assigned To: dmitry
 
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