PHP background procress

<?php
// https://github.com/cocur/background-process
use Cocur\BackgroundProcess\BackgroundProcess;

require dirname(__DIR__).'/vendor/autoload.php';

if(!isset($_SERVER['WTSERVER'])||$_SERVER['WTSERVER']!='windows'){
    ini_set('log_errors', 'On');
    ini_set('display_errors', 'Off');
    ini_set('error_log', dirname(__FILE__).'/error_log.log');
}

$process=new BackgroundProcess();
$process->run();

error_log(print_r(sprintf('Crunching numbers in process %d', $process->getPid()), true));

$intValue=1;
while($process->isRunning()){
    error_log($intValue);
    sleep(1);
    $intValue++;
    if($intValue>=1000){
        $process->stop();
    }
}