Gantt chart with multiple task bars/milestones

The code below is the source for this graph.

<?php
// Gantt chart with multiple task bars/milestones
require_once 'SVGGraph/autoloader.php';

$options = [
  'auto_fit' => true,
  'structure' => [
    'key' => 0, 'axis_text' => 1,
    'value' => [2,4,6,8,10],
    'end' => [3,5,7,9,11],
    'complete' => ['c1','c2','c3','c4','c5'],
    'milestone' => ['m1','m2','m3','m4','m5'],
    'label' => ['l1','l2','l3','l4','l5'],
  ],
  'bar_round' => 10,
  'show_data_labels' => true,
  'pad_right' => 20,
  'gantt_today' => false,
];

$values = [
  ['A0', 'A simple task', '2022-04-01', '2022-04-13', '2022-05-01', '2022-05-15', '2022-04-20',
  'c1' => 50, 'c2' => 25, 'm3' => true],
  ['A2a', 'Testing', '2022-04-13', '2022-04-15', '2022-05-15', '2022-05-17', '2022-05-21',
  'm3' => true, 'l3' => 'OK'],
  ['A1', 'Second task', '2022-04-05', '2022-04-20', 'c1' => 20],
  ['A2', 'Testing', '2022-04-20', '2022-04-21'],
  ['A3', 'Third task', '2022-05-02', '2022-05-17', 'c1' => 60],
  ['A4', 'Final task', '2022-05-16', '2022-05-20', 'c1' => 78],
  ['A5', 'Testing', '2022-05-20', '2022-05-20',
  '2022-04-05', null, '2022-04-19', 'm2' => true, 'm3' => true,
  'l2' => 'Test 1', 'l3' => 'Test 2',],
];

$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.