Description:
------------
I have all set up so as to output all errors.
the display_errors flag is On in the relevant .htaccess file, and error_reporting is set to E_ALL & ~E_NOTICE & ~E_STRICT

Just to be clear: whenever there is a PARSE ERROR or a call to a non-existing function, or any other kind of fatal error, anywhere in either the "entry" php file (the one called as a result of the http request) or ANY of the included files included via include(), require(), include_once(), require_once(), in all cases except the one I'll mention later, I usually get the fatal error message in the very output to the browser, and also logged to Apache's error_log file.

However, when the exact same kind of non-runtime error (e.g. a trivial syntax error) is in a file that is called via require() by a registered autoload function, registered via spl_autoload_register(), then I get no error message whatsoever and I just get an undebuggable blank page.
Additionally, the error is not even logged to Apache's error_log. So I waste days to find a trivial syntax error.

Test script:
---------------
--- index.php ---

    ini_set('unserialize_callback_func', 'spl_autoload_call');

    spl_autoload_register(array('My_Autoloader', 'autoload'), true);

    class My_Autoloader {
        static function autoload($classname) {
            $filename = //.... computes $filename from $classname
            require_once($filename);
        }
    }

    $instance = new MyClass();


--- /somewhere/MyClass.php ---
    class MyClass {
       lkandlnda ** SYNTAX ERROR HERE ** klsjdbklsj
    }

Expected result:
----------------
Parse error: syntax error, unexpected end of file in /somewhere/MyClass.php on line 3

(or something like that)

Actual result:
--------------
no output, nothing logged


I can't stress this enough: if the exact same parse error is in the main file, or in a file include()d or require()d in any other way than in an autoloader, then the error does show up in the output AND in the logs.