both: __autoload and exceptions are great features in php5, but together
they dont seem to work well. i want to add some kind of error reporting to autoload which will throw exception if class file wasnt found in my
predefined directories. i`ve prepared my own exception class which should
show me nice little error message. what i get is:
Fatal error: __autoload(dupa) threw an exception of type 'Exception' in
[blah blah] on line 87
Fatal error: Exception thrown without a stack frame in Unknown on line 0
the same happens when pure Exception class is used. 'try' block around full
code doesn`t help.
i use yesterday`s php5 windows build. should i report this as an error or
exceptions should [not] work like this?
rash
i found http://bugs.php.net/bug.php?id=26193 which explains my problem,
but...
the reason of problems with catching this exception seems to be no stack
frame added. can i set it by myself somehow in derived exception class?
my idea to working around this problem is to create temporary class (not
object), but im not sure if it can be done. in case of error i would create string with class declaration, 'eval' it and throw exception. specified exception for this problem would accept class name as one of params and undeclare the class. i cant however find any way of undeclaring/redeclaring
classes - is it possible?
rash
Don't have access to a running version of PHP right now (on vacation) but
by design __autoload() isn't supposed to propagate an exception. It's your
last chance to load the class and if it fails, then it dies. If this isn't
exactly what's happening then there's a problem.
The reason for this is, that due to __autoload() being called from quite a
few different contexts it is not clear (at least I can't quite remember)
how this will affect the run-time. It might end up being very problematic
as some code also assumes that it succeeds. I personally think, that in
most cases, there aren't very good reasons to throw exceptions from it. How
come you can't declare the class when __autoload() is called but you can do
so later? In such a weird situation, you could declare a proxy object with
the same name which relays all calls to the real class if/when you can load it.
So basically, I understand what you're saying, but I don't see a very
compelling reason to work very hard now to make this work differently.
Andi
At 05:38 PM 6/19/2004 +0200, Robert Janeczek wrote:
i found http://bugs.php.net/bug.php?id=26193 which explains my problem,
but...the reason of problems with catching this exception seems to be no stack
frame added. can i set it by myself somehow in derived exception class?my idea to working around this problem is to create temporary class (not
object), but im not sure if it can be done. in case of error i would create string with class declaration, 'eval' it and throw exception. specified exception for this problem would accept class name as one of params and undeclare the class. i cant however find any way of undeclaring/redeclaring
classes - is it possible?rash
most cases, there aren't very good reasons to throw exceptions from it.
How
come you can't declare the class when __autoload() is called but you can
do
so later? In such a weird situation, you could declare a proxy object with
the same name which relays all calls to the real class if/when you can
load it.
So basically, I understand what you're saying, but I don't see a very
compelling reason to work very hard now to make this work differently.
im working on application server for php. i need exception to continue server running after a component couldnt be found or properly loaded, or at
least close it with some trash cleaning. i wanted to write as few code in
__autoload as possible, but it seams that i`ll have to check all the
possibilities of crashing.
rash
ps. yes, i know php is supposed to work in a different way than java :] i
just love challenges ;)