I wrote a custom error handler for my site and I'm aware that PHP doesn't allow handling of parse and fatal errors. Is there something I can do to make it handle these errors? I don't want them being outputted to the user (but I want to use my error handler for them).
If it can't parse your script, it won't be able to parse your custom error handler.
You should have
display_errors off in your
php.ini and also set
error_reporting to none when your site is in production.
Also, I believe
set_error_handler() can handle fatal errors.