Syntactic sugar to quickly create a closure for an instance method. Especially useful for creating 'callables' to private methods.

NNReflectionMethod.php

<?php
class NNReflectionMethod extends ReflectionMethod
{
    static public function closure($object, $method)
    {   
        if(!is_object($object)) {
            throw new InvalidArgumentException('$object must be an object');
        }   

        $oRm = new ReflectionMethod($object, $method);
        return $oRm->getClosure($object);
    }   
}

Read the blog article here for the full writeup!