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Request #45767 Wording mistake: "Next exception" is "Previous exception" really
Submitted: 2008-08-08 17:13 UTC Modified: 2010-12-22 13:54 UTC
From: david at grudl dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.3.0alpha1 OS: *
Private report: No CVE-ID: None
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 [2008-08-08 17:13 UTC] david at grudl dot com 
Description:
------------
Chained exceptions are printed in uncommon order (from inner to outer exception). This makes me confused :-(

Reference: http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Throwable.html#printStackTrace()

Reproduce code:
---------------
    try {
        throw new FileNotFoundException("File not found.");

    } catch (FileNotFoundException $e) {

        throw new ConfigException("Missing configuration.", 0, $e);
    }

echo $e; // note $e is ConfigException!


Expected result:
----------------
exception 'FileNotFoundException' with message 'File not found.' in demo.php:8
Stack trace:
#0 demo.php(17): ...
#1 {main}

Next exception 'ConfigException' with message 'Missing configuration.' in demo.php:21
Stack trace:
#0 demo.php(28): ....
#1 {main}

Actual result:
--------------
exception 'ConfigException' with message 'Missing configuration.' in demo.php:21
Stack trace:
#0 demo.php(28): ....
#1 {main}

previous exception 'FileNotFoundException' with message 'File not found.' in demo.php:8
Stack trace:
#0 demo.php(17): ...
#1 {main}

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 [2008-08-08 17:15 UTC] david at grudl dot com 
Sorry - Expected result is Actual and Actual is Expected.
 [2008-08-09 20:45 UTC] johannes@php.net 
Thank you for this bug report. To properly diagnose the problem, we
need a short but complete example script to be able to reproduce
this bug ourselves. 

A proper reproducing script starts with <?php and ends with ?>,
is max. 10-20 lines long and does not require any external 
resources such as databases, etc. If the script requires a 
database to demonstrate the issue, please make sure it creates 
all necessary tables, stored procedures etc.

Please avoid embedding huge scripts into the report.

Your code handles an exception, throws a new one, which results in an "Fatal error: Uncaught exception", neither what you expect nor your actual code, please provide a proper reproduce case and explain the issue.
 [2008-08-10 08:39 UTC] david at grudl dot com 
Reproduce code:

<?php

class LowException extends Exception
{
}

class HighException extends Exception
{
}

$e = new LowException("File not found.");

$e = new HighException("Missing configuration.", 0, $e);

echo $e; // $e is HighException instance
?>


Expected result:
----------------
exception 'HighException' with message 'Missing configuration.' in test.php:13 
Stack trace:
#0 {main}

Previous exception (or "Caused by") 'LowException' with message 'File not found.' in test.php:11
Stack trace:
#0 {main}


Actual result:
---------------
exception 'LowException' with message 'File not found.' in test.php:11
Stack trace:
#0 {main}

Next exception 'HighException' with message 'Missing configuration.' in test.php:13
Stack trace:
#0 {main}


Description:
------------
The first (and most appealing) line of textual output begins with "exception 'LowException' with message ...", but the printed exception is 'HighException'. This order makes output less evident.
 [2008-08-10 09:54 UTC] johannes@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

You're assigning an object to a variable, then overwrite the variable with another and then echoing the variable holding the second object...
 [2008-08-11 15:03 UTC] david at grudl dot com 
This is not bug, of course, this is feature request.
 [2008-08-11 15:18 UTC] lstrojny@php.net 
At the end it is just a wording problem. "Next exception" should be "Previous exception" (which makes sense, than the method is called getPrevious()). Simple wording change, accepting it.
 [2008-08-11 16:04 UTC] david at grudl dot com 
This is not only simple wording change, but order change. 

$e is instance of HighException (!)
$e has any inner/previous exception

echo $e prints:

exception 'LowException' with message ...
blah, blah, blah
...
...

HighException prints LowException at first line - it is not expectable. Stack traces are printed in reverse order, because it is preferable. Exceptions should be printed in reverse order too.
 [2010-12-22 13:54 UTC] johannes@php.net
-Status: Open +Status: Bogus -Package: Feature/Change Request +Package: *General Issues
 [2010-12-22 13:54 UTC] johannes@php.net 
The order is "closest first"
 
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