<?php

$data = array(
    'labels' => array(
        array('string' => 'Sample'),
        array('number' => 'Piston 1'),
        array('number' => 'Piston 2')
    ),
    'data' => array(
        array('S1', 74.01, 74.03),
        array('S2', 74.05, 74.04),
        array('S3', 74.03, 74.01),
        array('S4', 74.00, 74.02),
        array('S5', 74.12, 74.05),
        array('S6', 74.04, 74.04),
        array('S7', 74.05, 74.06),
        array('S8', 74.03, 74.02),
        array('S9', 74.01, 74.03),
        array('S10', 74.04, 74.01),
    ),
    'title' => 'Piston Ring Diameter',
    'type' => 'line'
);

echo $this->GChart->start('test');
echo $this->GChart->visualize('test', $data);