phpldapadmin/app/Http/Middleware/CheckUpdate.php

<?php

namespace App\Http\Middleware;

use Closure;
use GuzzleHttp\Client;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

class CheckUpdate
{
	private const UPDATE_SERVER = 'https://version.phpldapadmin.org';
	private const UPDATE_TIME = 60*60*6;

	/**
	 * Handle an incoming request.
	 *
	 * @param  \Illuminate\Http\Request  $request
	 * @param  \Closure  $next
	 * @return mixed
	 */
	public function handle($request, Closure $next)
	{
		\Config::set('update_available',Cache::get('upstream_version'));

		return $next($request);
	}

	/**
	 * Handle tasks after the response has been sent to the browser.
	 *
	 * @return void
	 */
	public function terminate()
	{
		Cache::remember('upstream_version',self::UPDATE_TIME,function() {
			// CURL call to URL to see if there is a new version
			Log::debug(sprintf('CU_:Checking for updates for [%s]',config('app.version')));

			$client = new Client;

			$response = $client->request('POST',sprintf('%s/%s',self::UPDATE_SERVER,strtolower(config('app.version'))));

			if ($response->getStatusCode() === 200) {
				$result = json_decode($response->getBody());

				Log::debug(sprintf('CU_:- Update server returned...'),['update'=>$result]);

				return $result;
			}

			return NULL;
		});
	}
}