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Edit File: ExecutesMiddlewareTrait.php

<?php
/**
 * @package   SureCartCore
 * @author    SureCart <support@surecart.com>
 * @copyright 2017-2019 SureCart
 * @license   https://www.gnu.org/licenses/gpl-2.0.html GPL-2.0
 * @link      https://surecart.com/
 */

namespace SureCartCore\Middleware;

use Closure;
use SureCartVendors\Psr\Http\Message\ResponseInterface;
use SureCartCore\Requests\RequestInterface;

/**
 * Executes middleware.
 */
trait ExecutesMiddlewareTrait {
	/**
	 * Make a middleware class instance.
	 *
	 * @param  string $class
	 * @return object
	 */
	abstract protected function makeMiddleware( $class );

/**
	 * Execute an array of middleware recursively (last in, first out).
	 *
	 * @param  string[][]       $middleware
	 * @param  RequestInterface $request
	 * @param  Closure          $next
	 * @return ResponseInterface
	 */
	protected function executeMiddleware( $middleware, RequestInterface $request, Closure $next ) {
		$top_middleware = array_shift( $middleware );

if ( $top_middleware === null ) {
			return $next( $request );
		}

$top_middleware_next = function ( $request ) use ( $middleware, $next ) {
			return $this->executeMiddleware( $middleware, $request, $next );
		};

$instance  = $this->makeMiddleware( $top_middleware[0] );
		$arguments = array_merge(
			[ $request, $top_middleware_next ],
			array_slice( $top_middleware, 1 )
		);

return call_user_func_array( [ $instance, 'handle' ], $arguments );
	}
}

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