debugging - How do I debug a PHP WSOD?

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Very occasionally I get a mystifying
white-screen-of-death PHP error - nothing is displayed or logged, even with the
following
settings:

ini_set("error_reporting",E_ALL);
ini_set("display_errors",true);
ini_set("log_errors",true);
ini_set("display_startup_errors",true);
ini_set("html_errors",false);
ini_set("error_log","/var/log/php_error_log");

I
read somewhere that output buffering or memory limit errors can result in no error
output, but previously (for example) I have found a WSOD simply caused by __autoload()
looking for a missing class file.

Has anyone
found a way to get these errors visible? I hate commenting out blocks of
code.

Thanks

Answer

I had a similar problem recently and it
turned out that the software package I was using was overriding the logging settings so
that I was never seeing the logs in certain situations. Because your putting the
settings in the ini file, i'm guessing your using php.ini, there is a lot of opportunity
that something closer to where the code is run is changing the
settings.

My advice would be to put
error_reporting(E_ALL | E_STRICT); in the file that is causing
the problem and see if that improves things.