<?php
use Symfony\Component\HttpKernel\DataCollector\MemoryDataCollector;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
$dataCollector = new MemoryDataCollector();
$request = Request::createFromGlobals();
$response = (new Response('blabla'))->prepare($request);
$dataCollector->collect($request, $response);
echo $dataCollector->getMemory() . PHP_EOL;
$array = range(0, 10000);
$dataCollector->updateMemoryUsage();
echo $dataCollector->getMemory() . PHP_EOL;