<?php
// class names are case-insensitive
class Point {
private $x;
private $y;
static $grid_size = 100;
function __construct($x = 0, $y = 0) {
if ($this->check_coords($x, $y)) {
$this ->x = $x;
$this ->y = $y;
}
}
private function check_coords($x, $y) {
if ($x < 0 || $y < 0 || $x > Point::$grid_size || $y > Point::$grid_size)
return false;
return true;
}
function printp() {
print "\$x = $this->x \$y = $this->y<br />\n";
}
function move($dx, $dy) {
if ($this -> check_coords($this ->x + $dx, $this ->y + $dy)) {
$this ->x += $dx;
$this ->y += $dy;
}
}
}
class ColorPoint extends Point {
private $color;
function __construct($x, $y, $color) {
parent::__construct($x,$y);
$this -> color = $color;
}
function setColor($color) {
$this -> color = $color;
}
function printp() {
parent::printp();
print "{$this -> color} <br />\n";
}
}
?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<!--
PHP object-oriented features
Author: Elena Machkasova
Last modified: 5/6/08
-->
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>
Testing a point class
</title>
</head>
<body>
<h2>Testing a point class</h2>
<p>
<?php
require_once("point.php");
$point1 = new Point(1,3);
print "point1: ";
$point1->printp();
$point2 = new Point();
print "point2: ";
$point2->printp();
$point2->move(5, 7);
print "point2 after the move: ";
$point2->printp();
$color_point = new ColorPoint(3, 7, "red");
print "color point: ";
$color_point->printp();
?>
</p>
</body>
</html>
http://rynite.morris.umn.edu/~elenam/1101_spring08/object_oriented/test_points.php