Description:
------------
Today I want to request the feature of having a function callback (callable) in case all autoloaders on the SPL-Autoloader-Stack failed.
Personally, I'll find it useful, to trow an Exception when all the autoloaders weren't able to load the class. For me a workaround is, the register a last SPL-Autoload function, in which I throw the Exception (the autoloaders before my last wren't successful, if my function runs). But I don't thing, that this is a semantically correct way to do this. In my opinion, something like a error callback should exist.

Greetings from Germany,
Alexander Jank

Test script:
---------------
<?php
class ClassNotFoundException extends \RuntimeException{
	public function __construct($className) {
		parent::__construct(sprintf(
			'Class "%s" does not exist',
			$className
		));
	}
}
//Workaround
function MainAutoloader($class) {
	//look for the class and include it (if file exists)
	if(class_exists($class)) {
		return true;
	} else {
		return false; /* next autoloader will be called */
	}
}
function MainAutoloadErrorHandler($class) {
	throw new ClassNotFoundException($class);
}
spl_autoload_register('MainAutoloader');
spl_autoload_register('MainAutoloadErrorHandler');
?>