How do you get multiple error handlers in PHP?

Question

I tried this:

    set_error_handler('ReportError', E_NOTICE | E_USER_NOTICE);
    set_error_handler('ErrorHandler', E_ALL & ~(E_NOTICE | E_USER_NOTICE));

But only the second one works. How do I have different error handlers for different types of errors?

Answer 1

Why not have one error handler and filter by error type in the handler and call different functions from there? Make a GenericErrorHandler() and do this in it:

switch($errno){
   case E_USER_ERROR: UserErrorHandler(...); break;
}

Answer 2

So, to latch on to what Westie is saying, the important part is you can only have one error handler, and the set_error_handler() function returns the previously defined error handler, or null if none were defined. So in your error handlers, possibly use a class that stores the previous error handler when registering it, so that when you handle errors with your class method, call the previous error handler as well. An excerpt from the raven-php Sentry client:

    public function registerErrorHandler($call_existing_error_handler = true, $error_types = -1)
{
    $this->error_types = $error_types;
    $this->old_error_handler = set_error_handler(array($this, 'handleError'), error_reporting());
    $this->call_existing_error_handler = $call_existing_error_handler;
}

and then the handle error method:

    public function handleError($code, $message, $file = '', $line = 0, $context=array())
{
    if ($this->error_types & $code & error_reporting()) {
      $e = new ErrorException($message, 0, $code, $file, $line);
      $this->handleException($e, true, $context);
    }

    if ($this->call_existing_error_handler && $this->old_error_handler) {
        call_user_func($this->old_error_handler, $code, $message, $file, $line, $context);
    }
}