Re: Error recovery - fatal errors

On 14 May 2011 12:33, Tim Streater <tim@clothears.org.uk> wrote: > I would like, in my app, to recover from as many run-time errors as possible, so that I can > tidy up. And unsolicited output generated by the standard error system is really unhelpful as it > becomes part of the ajax reply to the browser. > > So I've added my own error handler, but it seems that I can't catch fatal errors. The > error in question comes from doing something like: Fatal errors are fatal - if you could recover from them, they wouldn't be fatal. > $res = $dbh->query ($sql); > > with $sql being an SQL statement, and $dbh being a database handle. I recently had a case where > $dbh was NULL, which triggers a fatal error from SQLite. In principle such a bug should show up > quickly, but this one had lain untriggered for about a year. It seems to me somewhat arbitrary for > this to be designated a fatal error. Is there a way I can catch these? Most SQLite error situations > I'm solving with try/catch but no luck with this one so far. You've got something wrong: either $dbh is not null or the error is not from sqlite. I'm guessing the former. To avoid situations like that, do proper error checking (i.e. actually check that your database connection was opened succesfully). > Error handling in library packages seems somewhat arbitrary - e.g. opendir may give an > E_WARNING, but closedir, readdir don't. > You can avoid all problems with error output by turning off error displays in php.ini (set display_errors = off) - use error logging instead. That's the recommended setting for production servers. Regards Peter -- <hype> WWW: plphp.dk / plind.dk LinkedIn: plind BeWelcome/Couchsurfing: Fake51 Twitter: kafe15 </hype>