Universal error handler

The process of developing a universal error handler is quite similar to the preceding recipe. There are certain differences, however. First of all, in PHP 7, some errors are thrown and can be caught, whereas others simply stop your application dead in its tracks. To further confuse matters, some errors are treated like exceptions, whereas others are derived from the new PHP 7 Error class. Fortunately for us, in PHP 7, both Error and Exception implement a new interface called Throwable. Accordingly, if you are not sure whether your code will throw an Exception or an Error, simply catch an instance of Throwable and you'll catch both.

How to do it...

1. Modify the Application\Error\Handler class defined in the preceding recipe. In the constructor, set a new errorHandler() method as the default error handler:

   public function __construct($logFileDir = NULL, $logFile = NULL)
   {
     $logFile    = $logFile    ?? date('Ymd') . '.log';
     $logFileDir = $logFileDir...