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Date: Thu, 19 May 2016 14:30:07 -0600
Message-ID: <CAObuZdsdvVfHokzP__xJQ7hac3t=7nmBAp49e1Om0EQ=RXGryw@mail.gmail.com>
To: Rowan Collins <rowan.collins@gmail.com>
Cc: "internals@lists.php.net" <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a1136f86603da4d053337d7ce
Subject: Re: [PHP-DEV] Exception::getLine()
From: derokorian@gmail.com (Ryan Pallas)

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On Thu, May 19, 2016 at 1:47 PM, Rowan Collins <rowan.collins@gmail.com>
wrote:

> On 19/05/2016 19:35, Rasmus Schultz wrote:
>
>> Technically, every throw is a new exception "flow" - even if you're >
>> recycling the Exception instance, it's the throw statement that >
>>
> starts the unique stack unwind from the throw site; it's where the >
> action happens.
>
> That's one interpretation, but it doesn't really hold up in all cases.
> Consider a catch statement that needs to filter more granularly than the
> class name; since you already mentioned PDO, I'll make an example with that:
>
> catch ( PDOException $e ) {
>     if ( substr($e->getCode(), 0, 2) === '08' ) {
>         $this->reconnect();
>     } else {
>         throw $e;
>     }
> }
>
> Of what value to a subsequent catch statement is the trace of that throw
> statement? And why does that "start a new exception flow", but if PDO threw
> different sub-classes, you could let one flow through unmodified by
> tightening the catch statement?
>

True, but if you instead of throwing the same exception, threw a new one,
you could capture both stacks. But you can never get the stack from the
throw point of something created elsewhere.

catch ( PDOException $e ) {
    if ( substr($e->getCode(), 0, 2) === '08' ) {
        $this->reconnect();
    } else {
        throw new PDOException($e->getMessage(), $e->getCode(), $e);
    }
}



> Regards,
> --
> Rowan Collins
> [IMSoP]
>
>
>
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> PHP Internals - PHP Runtime Development Mailing List
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