Minify.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Response;

class Minify
{
    public function handle($request, Closure $next)
    {
        $response = $next($request);

        if ($this->isResponseObject($response) && $this->isHtmlResponse($response)) {
            $replace = [
              '/\>[^\S ]+/s'                                                      => '>',
              '/[^\S ]+\</s'                                                      => '<',
              '/([\t ])+/s'                                                       => ' ',
              '/^([\t ])+/m'                                                      => '',
              '/([\t ])+$/m'                                                      => '',
              '~//[a-zA-Z0-9 ]+$~m'                                               => '',
              '/[\r\n]+([\t ]?[\r\n]+)+/s'                                        => "\n",
              '/\>[\r\n\t ]+\</s'                                                 => '><',
              '/}[\r\n\t ]+/s'                                                    => '}',
              '/}[\r\n\t ]+,[\r\n\t ]+/s'                                         => '},',
              '/\)[\r\n\t ]?{[\r\n\t ]+/s'                                        => '){',
              '/,[\r\n\t ]?{[\r\n\t ]+/s'                                         => ',{',
              '/\),[\r\n\t ]+/s'                                                  => '),',
              '~([\r\n\t ])?([a-zA-Z0-9]+)=\"([a-zA-Z0-9_\\-]+)\"([\r\n\t ])?~s'  => '$1$2=$3$4', 
            ];
            
            $remove = [
              '</option>', '</li>', '</dt>', '</dd>', '</tr>', '</th>', '</td>'
            ];

            $response->setContent(str_ireplace($remove, '', preg_replace(array_keys($replace), array_values($replace), $response->getContent())));
        }

        return $response;
    }

    protected function isResponseObject($response)
    {
        return is_object($response) && $response instanceof Response;
    }

    protected function isHtmlResponse(Response $response)
    {
        return strtolower(strtok($response->headers->get('Content-Type'), ';')) === 'text/html';
    }
}