PHP code example of zeroseven / critical-css

1. Go to this page and download the library: Download zeroseven/critical-css library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php. 
    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

zeroseven / critical-css example snippets


....

use Zeroseven\CriticalCss\Event\CriticalCssRequierdEvent;

class CriticalCssEventListener
{
    public function __invoke(CriticalCssRequierdEvent $event): CriticalCssRequierdEvent
    {
        if ($event->getRequest()->hasHeader('X-SKIP-CRITICAL-CSS')) {
            $event->setRequiered(false);
        }

        return $event;
    }
}