parallel_prefork_synopsis.php

<?php

require_once 'Parallel/Prefork.php';

$pm = new Parallel_Prefork(array(
    'max_workers'  => 10,
    'fork_delay'   => 1,
    'trap_signals' => array(
        SIGTERM => SIGTERM,
        SIGHUP  => SIGTERM,
        SIGUSR1 => null,
    ),
));

while ($pm->signalReceived() !== SIGTERM) {
    load_config();
    if ($pm->start() === true) {
        continue;
    }

    ... do some work within the child process ...

    $pm->finish();
}

$pm->waitAllChildren();