Structured pie graph explosion

The code below is the source for this graph.

<?php
// Structured pie graph explosion
require_once 'SVGGraph/autoloader.php';

$settings = [
  'auto_fit' => true,
  'back_stroke_width' => 0,
  'structure' => [
    'key' => 0,
    'value' => 1,
    'explode' => 2,
  ],
  'explode' => 'none',
  'explode_amount' => 30,
  'data_label_font_size' => 10,
  'data_label_back_colour' => '#333',
  'sort' => false,
  'label_colour' => '#fff',
];

$values = [
  ['Tea', 10],
  ['Coffee', 20, 1.0],
  ['Milk', 25, 0.5],
  ['Water', 50],
];

$colours = ['#e97','#630','#edd', ['#6bf','pattern' => 'polkadot2']];

$graph = new Goat1000\SVGGraph\SVGGraph(300, 200, $settings);
$graph->colours($colours);
$graph->values($values);
$graph->render('ExplodedPieGraph');

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.