Gantt chart, task bars only

The code below is the source for this graph.

<?php
// Gantt chart, task bars only
require_once 'SVGGraph/autoloader.php';

$options = [
  'auto_fit' => true,
  'structure' => [
    'key' => 0, 'value' => 1, 'end' => 2,
  ],
  'bar_round' => 10,
  'gantt_today' => false,
];

$values = [
  ['A simple task', '2022-04-01', '2022-04-13'],
  ['Second task', '2022-04-05', '2022-04-20'],

  ['Third task', '2022-05-02', '2022-05-17'],
  ['Final task', '2022-05-16', '2022-05-20'],
];

$graph = new Goat1000\SVGGraph\SVGGraph(670, 'auto', $options);
$graph->values($values);
$graph->colourRangeHexHSL(0, '#c50', '#c59');
$graph->colourRangeHexHSL(1, '#6a0', '#6a9');
$graph->render('GanttChart');

Please note: the source code above comes from a script used to generate one of the example graphs on the site. This is simply a wrapper page to apply highlighting and make the source code easier to read, so there is no content here to describe what the source code is doing.