Everything

php

Default exception handler

php.internals

(Marcus Börger)

22 years ago

Hello internals, hi Zeev, hi Andi,

Currently php doesn't have a default exception handler that gets executed
if the thrown excpetion was not caught by any previous handler. I now
suggest the following extension:

try {
// code
}
catch (class1 $var) {
}
catch (class2 $var) {
}
catch ($var) {
}

Thereby it should only be possible to have an exception handler that does
not specify a class as the last one. Since we only allow throwing objects at
the moment we know that the caught variable is any object and hence we do
not need a syntax like catch (...) provided by C++ for example.

An alternative concept would be to allow throwing exception instances only.
But inside the C code you could still throw other objects.

A patch to enable the new syntax can be found here:
http://marcus-boerger.de/php/ext/ze2/ze2-catch-20030905.diff.txt


Best regards,
Marcus                          mailto:marcus.boerger@post.rwth-aachen.de

Sebastian Bergmann

22 years ago

Marcus B?rger wrote:

> try {
>   // code
> }
> catch (class1 $var) {
> }
> catch (class2 $var) {
> }
> catch ($var) {
> }

I thought that only objects of the Exception class and subclasses
thereof can be throw()n.

If that is not the case yet, make it so and

try { /* code */ }

catch (SomeException $e) {}
catch (Exception $e) {}

works just fine ;-)

> An alternative concept would be to allow throwing exception instances
> only.

See above ;)

--
Sebastian Bergmann
http://sebastian-bergmann.de/                   http://phpOpenTracker.de/

Das Buch zu PHP 5: http://professionelle-softwareentwicklung-mit-php5.de/

(Marcus Börger)

22 years ago

Hello Marcus,

Friday, September 5, 2003, 5:24:21 PM, you wrote:

> Hello internals, hi Zeev, hi Andi,

> A patch to enable the new syntax can be found here:
> http://marcus-boerger.de/php/ext/ze2/ze2-catch-20030905.diff.txt

Well, forget about the patch for the moment it doesn't really work :-(

--
Best regards,
Marcus                            mailto:helly@php.net

Andi Gutmans

22 years ago

Hi Marcus,

I implemented this functionality about a year ago (if I'm not mistaken it
was part of the original ZE2 tree).
The reason we removed it (IIRC) was that we thought it would lead to
cleaner PHP code and would force only objects being thrown (although this
can be done in other ways).
I would like to keep things as-is because I think it's cleaner this way.
Give the developer the benefit of the tought that he can design his
Exception hierarchy in a good way, wether he inherits from our "Exception"
class or from his own exception class.

Andi

Cristiano Duarte

22 years ago

Hi Andi,
IMHO I think there should be a way to catch all kinds of exceptions whether
they inherits from "Exception" or not. It's specially important in
standalone applications like those in PHP-GTK. An external library can throw
an unkown exception an it could terminate the program abnormally. Instead,
if we can catch this (at the moment) "unknown exception", maybe it would be
possible to recover the program stability.

Cristiano Duarte

"Andi Gutmans" <andi@zend.com> escreveu na mensagem
news:5.1.0.14.2.20030906082904.036cf2d0@127.0.0.1...