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Status:Closed Asked:Nov 02, 2006 - 03:13 AM

error handling in php?

How do I handle "difficult" errors in PHP?
I have a call to the method "imagecreatefromjpeg" which seems to break the script, but I don't get any error message.
I have enabled the ERROR_REPORTING(E_ALL); on the page.
I think it's because it's running into a full memory problem, but how do I know, and how do I handle it?
Basically what I'm doing is running through all the jpg images in a directory, creating thumbnails for them. And it works fine until a certain point and then just a blank page is output and nothing more.

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Tags: error handling, PHP

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dustPuppy

I forgot to mention that I'm using PHP Version 5.1.6 on a Windows NT NS13 5.2 build 3790 machine.

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Nov 02, 2006 - 11:32 PM

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dustPuppy

Well, finally it was a problem of several coinciding elements.
My host doesn't allow errorreporting directly on the page, so that was why I wasn't getting the error.
And the error was a script exceeded timeout problem, which could be solved by setting
set_time_limit($seconds);

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Nov 03, 2006 - 05:26 AM

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dustPuppy

I'm wondering though, how to handle fatal errors in php. Isn't there a nice way to take care of those, instead of everything breaking down? I mean at least capturing the error and showing a custom error message instead?

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Nov 03, 2006 - 05:27 AM

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xarcus

The best way to handle errors is try not to make them.
So it would be good to add to each module a test set to discard it when problems arise.

Then there is the environment. Set a phpinfo page to check your config. parameters in the target web zone.

There are three handlers you can set, from which you can log anything you want to a file in your site with the function error_log.

With register_shutdown_function( “myOnShutdown”) you may set a function that executes at the end of request processing.

With set_error_handler( “myOnError”) you may handle the errors yourself.

With PHP5 set_exception_handler(“myOnException”) you may set an exception handler for uncaught exceptions.

There are also some network debuggers, explained at http://es2.php.net/manual/en/debugger..., but you need access to certains sockets so it is not available when app. is hosted.

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Nov 16, 2006 - 07:34 AM

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xarcus

From the manual (http://es2.php.net/manual/en/function...)

>> The following error types cannot be handled with a user defined function: E_ERROR, E_PARSE, E_CORE_ERROR, E_CORE_WARNING, E_COMPILE_ERROR, E_COMPILE_WARNING, and most of E_STRICT raised in the file where set_error_handler() is called.

>> If errors occur before the script is executed (e.g. on file uploads) the custom error handler cannot be called since it is not registered at that time.

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Nov 16, 2006 - 07:58 AM

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xarcus

E_ALL does not include all errors (E_STRICT type is excluded).

You should write
error_reporting(E_ALL | E_STRICT)

for all errors. ( see note at http://es2.php.net/manual/en/function...).

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Nov 16, 2006 - 08:09 AM

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dustPuppy

that's great info there, xarcus.
I think set_exception_handler(“myOnException”) is what I was looking for.
Thanks a lot.

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Nov 16, 2006 - 09:08 AM

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