DeferredCallable.php

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<?php
namespace Slim;

use Closure;
use Psr\Container\ContainerInterface;

class DeferredCallable
{
    use CallableResolverAwareTrait;

    private $callable;
    private $container;

    public function __construct($callable, ContainerInterface $container = null)
    {
        $this->callable = $callable;
        $this->container = $container;
    }

    public function __invoke()
    {
        $callable = $this->resolveCallable($this->callable);
        if ($callable instanceof Closure) {
            $callable = $callable->bindTo($this->container);
        }

        $args = func_get_args();

        return call_user_func_array($callable, $args);
    }
}