- var_dump: documentation ( source)
<?php
$settings['numberOfProcesses'] = 5;
$settings['processNumber'] = 1;
$maxID = 1000000;
$size = (int)($maxID/$settings['numberOfProcesses']);
$start = (int)($size*($settings['processNumber']));
$end = (int)($size*($settings['processNumber']+1));
var_dump($start);
var_dump($end);