If you have a number of applications that use PHPlot, and you want to standardize some of the PHPlot default settings, you can define your own class which extends the PHPlot class and changes the default settings. Here is a short example of a custom PHPlot class, which changes the following defaults:

To extend the PHPlot class, declare your class as shown below. Make sure your class constructor calls the PHPlot class constructor before changing any settings.

<?php
# Define a custom PHPlot class

// Load the PHPlot class first
require_once 'phplot.php';

// Define a class which extends PHPlot:
class my_phplot extends PHPlot {
  function __construct($width=800, $height=600, $out=NULL, $in=NULL)
  {
    parent::__construct($width, $height, $out, $in);
    $this->SetDefaultTTFont('LiberationSans-Bold'); // System dependent
    $this->SetTitleColor('red');
  }
}

To use this custom PHPlot class, use require_once to include the file containing the class definition, then create an instance of the custom class.

$plot = new my_phplot();

You can then use the $plot object exactly the same as you might use any other PHPlot object.