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Example of a factory method and comparators
Objects in PHP example from a Well House Consultants training course
More on Objects in PHP [link]

This example is described in the following article(s):
   • What is a factory? - [link]
   • Object factories in C++, Python, PHP and Perl - [link]

If you're searching for a page where you can try this code, select here

Source code: factory.php Module: H108

# Example of a factory method and comparators

# A fairly conventional base class ...

class pubtrans {
__construct($when,$size,$mins,$place) {
$this->time $when;
$this->capa $size;
$this->seconds $mins 60;
$this->place $place;
moreroadworks($delay) {
$this->seconds += $delay 60;
getbummins() {
$this->capa $this->seconds 60 ;

# Some comparator methods ...

function bigger($that) {
                if (
$this->getbummins() > $that->getbummins())

        static function 
biggest($ofthese) {
$bsf $ofthese[0];
                foreach (
$ofthese as $tryme) {
$bsf $bsf->bigger($tryme);

# A factory to create the objects of either type ...

static function myfactory($lyne) {
$dep_t,$capa,$run_t,$dest,$wotsit) = explode(" ",trim($lyne));
                if (
$wotsit == "train") {
                        return (new 
                } else {
                        return (new 

# Our subclasses

class train extends pubtrans {
getopo() {
"First Great Western";
bus extends pubtrans {
getopo() {
"First Bath and Bristol";

# ---------- Here's the main application

$southbound file("southbound.txt");
$options = array();

foreach (
$southbound as $lyne) {

$html "";
foreach (
$options as $current) {
$train $current->getbummins();
$itsa $current->getopo();
$html .= "This $itsa-operated one is $train in bummin value<br>";

$x1 $options[2];
$x2 $options[0];

$greater $x2->bigger($x1);
$train $greater->getbummins();
$itsa $greater->getopo();
$html .= "<br>Greater $itsa-operated one is $train in bummin value<br>";

$greatest pubtrans::biggest($options);
$train $greatest->getbummins();
$itsa $greatest->getopo();
$html .= "Greatest $itsa-operated one is $train in bummin value<br>";

# And the template in which to display the results:
<h1>Example that uses a factory method in PHP</h1>
<?= $html ?>

Learn about this subject
This module and example are covered on the following public courses:
 * Object Oriented Programming in PHP
 * PHP Programming
 * Learning to program in PHP
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering PHP are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Objects in PHP" training module. You'll find a description of the topic and some other closely related examples on the "Objects in PHP" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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The Horse's mouth provides a daily tip or thought.
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• All of these resources can be searched through through our search engine
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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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