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Date: Sun, 6 May 2012 12:04:07 +0800
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To: Devis Lucato <devis@lucato.it>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] catching exception using a variable passed by reference
From: laruence@php.net (Laruence)

On Sun, May 6, 2012 at 11:47 AM, Laruence <laruence@php.net> wrote:
> On Sun, May 6, 2012 at 8:40 AM, Devis Lucato <devis@lucato.it> wrote:
>> Hi,
>>
>> I stumbled upon this code while working with a variable passed by
>> reference, I was wondering if someone could provide some feedback before
>> raising a ticket, just in case PHP (5.3.6) is doing what it's supposed t=
o
>> do.
>> In the code below I would expect "catch" to change the variable as
>> an assignment would do, but that doesn't happen.
>>
>> =C2=A0function foo(&$exception)
>>> {
>>> =C2=A0 =C2=A0 try {
>>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 throw new Exception('foo error');
>>> =C2=A0 =C2=A0 } catch (Exception $exception) {
>>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 var_dump(gettype($exception));
>>> =C2=A0 =C2=A0 =C2=A0 =C2=A0 echo $exception->getMessage() . "\n";
>>> =C2=A0 =C2=A0 }
>>> }
>>> foo($error);
>>> var_dump(gettype($error));
>>
>>
>>
>> Expected:
>>
>>> string(6) "object"
>>> foo error
>>> string(6) "object"
>>
>>
>> Current result:
>>
>>> string(6) "object"
>>> foo error
>>> string(4) "NULL"
>>
>>
>>
>> It looks like "catch" is creating a completely new variable in the scope=
,
>> also removing the existing one from it.
Hi:
   after a deep look,  I think it's not a bug.

   the exception in the catch block is only a local var of that block.

   I think you should change you codes like following to accomplish
your requirement:

  function foo(&$exception)
{
    try {
        throw new Exception('foo error');
    } catch (Exception $e) {
        var_dump(gettype($e));
        $exception =3D $e;
        echo $e->getMessage() . "\n";
    }
}
foo($error);
var_dump(gettype($error));

thanks
> Hi,
>
> =C2=A0 =C2=A0could you file a bug at bugs.php.net? =C2=A0:)
>
> thanks
>> I appreciate this is an edge case, if not a bug is it worth adding it to
>> http://php.net/manual/en/language.exceptions.php or somewhere under
>> http://www.php.net/manual/en/language.references.php ?
>>
>>
>> Thank you!
>
>
>
> --
> Laruence =C2=A0Xinchen Hui
> http://www.laruence.com/



--=20
Laruence =C2=A0Xinchen Hui
http://www.laruence.com/