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To: internals@lists.php.net, "Anthony Ferrara" <ircmaxell@gmail.com>
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Date: Sun, 02 Sep 2012 10:55:36 +0200
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Subject: Re: [PHP-DEV] Exceptions Vs Errors
From: glopes@nebm.ist.utl.pt ("Gustavo Lopes")

On Sun, 02 Sep 2012 03:39:15 +0200, Anthony Ferrara <ircmaxell@gmail.com>  
wrote:

> So, while I know there's some discontent about having the core raise
> exceptions, let me ask the question differently:
>
> Without moving to exceptions, how could the current error and error
> handling mechanisms be improved to make the scenario I posted above  
> easier.

I don't think your specific scenario needs to be improved.  
file_put_contents() is a high level function with coarse error reporting.  
If you need to distinguish the problems, you can open the files  
separately, and use stream_copy_to_stream().

But in any case, for the general problem you're raising -- that false does  
not give enough information for handling the error, the solution is  
well-established: you have some way of getting the error code. This can be  
done either through a dedicated function (like curl_errno, mysqli_errno)  
or through extra parameters, like it's done in stream_socket_client(). And  
yes, it's unfortunate we don't have any sort of common interface or even  
consistency in this area.

> To make handling errors just as easy as ignoring them (or preferably
> easier)...?

I don't think that's feasible, except maybe by using checked exceptions  
(which most people hate, with good reason). Writing bad exception-based  
code and bad error-code-based code is always easy. See the tables here:  
http://blogs.msdn.com/b/oldnewthing/archive/2005/01/14/352949.aspx


-- 
Gustavo Lopes