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Bug #51487 set_error_handler() misbehave under certain circumstancies
Submitted: 2010-04-06 13:56 UTC Modified: 2013-02-18 00:34 UTC
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (50.0%)
From: fabien dot potencier at symfony-project dot org Assigned:
Status: No Feedback Package: Scripting Engine problem
PHP Version: 5.3.2 OS: All
Private report: No CVE-ID: None
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From: fabien dot potencier at symfony-project dot org
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 [2010-04-06 13:56 UTC] fabien dot potencier at symfony-project dot org
When throwing an exception from a custom error handler, PHP sometimes dies with a non-obvious error as the actual problem is hidden.

To reproduce, create a simple set_error_handler() and throw an exception (ErrorException here) whenever an error occur (with error_reporting set to -1 for instance).

If you try to output a not-defined variable, you will see the Exception. But, if you call a method on a not-defined variable, the exception is not thrown, and an error message is displayed instead. Debugging is not trivial as the real problem is masked.

Test script:
set_error_handler(function ($level, $message, $file, $line, $context)
  throw new \ErrorException($message);

// will throw an Exception (Undefined variable: foo)
// echo $foo;

// will not throw the exception, PHP will try to call bar() instead

Expected result:
PHP Fatal error:  Uncaught exception 'ErrorException' with message 'Undefined variable: foo' in ..:..

Actual result:
PHP Fatal error:  Call to a member function bar() on a non-object in ... on line 0


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 [2010-04-06 14:31 UTC]
-Status: Open +Status: Feedback
 [2010-04-06 14:31 UTC]
bug #51463 might be related, stas also worked on a similar bug where I don't find the commit or bug id right now. Could you pleasetest the latest snapshot, maybe this was fixed. Thanks.
 [2010-04-06 15:07 UTC] fabien dot potencier at symfony-project dot org
I have just tested with php5.3-201004061030, and the problem is not fixed.

The output is indeed better, as the line is not 0 anymore:

Call to a member function call() on a non-object in ... on line 9

instead of:

Call to a member function call() on a non-object in ... on line 0
 [2013-02-18 00:34 UTC] php-bugs at lists dot php dot net
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