Sample of running a starting tasklet, waiting for it to finish and start another

burn-dvd.php

<?php
require_once 'app.php';

$id = \App\Task\add($title = 'DVD XML Info', $cmd = 'lsdvd -Ox');

while (!\App\Task\isCompleted($id)) {
    sleep(1);
}

$task = \App\Task\get($id);

$xml = new SimpleXMLElement($task->output);

$cmd = sprintf(
    'mplayer dvd://%s -v -dumpstream -dumpfile %s.vob', 
    $xml->longest_track,
    $xml->title
);

\App\Task\add('Rip DVD!!!!', $cmd);
?>