public function push($middleware)
    {
        if (! $middleware instanceof MiddlewareInterface &&
            ! is_callable($middleware)
        ) {
            throw new InvalidArgumentException(
                "Middleware stack accepts only MiddlewareInterface object or callable"
            );
        }

        array_push($this->middlewareStack, $middleware);
        return $this;
    }
public function push($middleware)
    {
        if (! $middleware instanceof MiddlewareInterface &&
            ! is_callable($middleware)
        ) {
            throw new InvalidArgumentException(
                "Middleware stack accepts only MiddlewareInterface object or callable"
            );
        }

        array_push($this->middlewareStack, $middleware);
        return $this;
    }
public function push ( $ middleware ) { if ( ! $ middleware instanceof MiddlewareInterface && ! is_callable ( $ middleware ) ) { throw new InvalidArgumentException ( "Middleware stack accepts only MiddlewareInterface object or callable" ) ; } array_push ( $ this -> middlewareStack , $ middleware ) ; return $ this ; }
Pushes a middleware to the stack

@param MiddlewareInterface|callable $middleware

@return MiddlewareStack
Pushes a middleware to the stack