(Hacky) DCI in PHP 5.4

dci.php

<?php

/***********************************************************************
UPDATE: See my improved example: https://gist.github.com/mbrowne/5047982
************************************************************************/

ini_set('display_errors', 1);

trait AssignableToRole
{
    protected $methods = array();
 
    public function addMethod($methodName, $methodCallable)
    {
        if (!is_callable($methodCallable)) {
            throw new InvalidArgumentException('Second param must be callable');
        }
        $this->methods[$methodName] = Closure::bind($methodCallable, $this, get_class());
    }
    
    public function removeMethod($methodName)
    {
  	unset($this->methods[$methodName]);
    }
    
    //TODO: handle method name conflicts
    public function addRole($traitOrClassName) {
    	if (trait_exists($traitOrClassName)) {
    		$className = $traitOrClassName.'Class';
    		//We need a real class in order to be able to instantiate it,
    		//so we can pass the instance to getClosure() below
    		if (!class_exists($className)) {
    			eval('class '.$className.' {use '.$traitOrClassName.';}');
    		}
    	}
    	elseif (!class_exists($traitOrClassName)) {
    		throw new InvalidArgumentException("Trait or class named '$roleTraitName' is not defined");
    	}
    	else $className = $traitOrClassName;
    	
	$tmp = new $className;
	$reflClass = new ReflectionClass($tmp);
	$reflMethods = $reflClass->getMethods();
	foreach ($reflMethods as $method) {
		$this->addMethod($method->name, $method->getClosure($tmp));
	}
    }
    
    //TODO
    public function removeRole($traitOrClassName) {
    }
 
    public function __call($methodName, array $args)
    {
        if (isset($this->methods[$methodName])) {
            return call_user_func_array($this->methods[$methodName], $args);
        }
        throw RuntimeException('There is no method with the given name to call');
    }
}

class Person
{
	use AssignableToRole;
}

trait EmployeeRole
{
	function work() {
		echo "I'm working on it...";
	}
}

$person = new Person;
$person->addRole('EmployeeRole');

$person->work();