为什么我不能用PHP 5.2处理CakePHP 2.x中的致命错误？

I'm having a strange problem in CakePHP where my AppExceptionRenderer is not being triggered for fatal and parse errors (E_ERROR and E_PARSE) when using PHP 5.2. The exact same code on my development machine (PHP 5.5) works fine.

Any ideas why?

I ended up tracking it down to what appears to be a bug in PHP 5.2 where a call to new SplFileInfo() strangely resets the fatal error information that normally exists inside error_get_last().

My fix was to tweak Cake's default App::shutdown() function by moving the _checkFatalError() call up above the Cache::write() calls.

So the result was this...

public static function shutdown() {
    // For some weird reason on PHP 5.2 the SplFileInfo call made in Cache::write 
    // resets error_get_last() which means we can't trap fatal/parse errors.  
    // Small workaround is to check for errors *before* doing the caching thing
    self::_checkFatalError();

    if (self::$_cacheChange) {
        Cache::write('file_map', array_filter(self::$_map), '_cake_core_');
    }
    if (self::$_objectCacheChange) {
        Cache::write('object_map', self::$_objects, '_cake_core_');
    }
    // self::_checkFatalError();
}

Perhaps it may help someone else out there someday. :-)