| <?php |
| |
| # This example illustrates how member variables are wrapped. |
| |
| # ----- Object creation ----- |
| |
| print "Creating some objects:\n"; |
| $c = new Circle(10); |
| print " Created circle\n"; |
| $s = new Square(10); |
| print " Created square\n"; |
| |
| # ----- Access a static member ----- |
| |
| print "\nA total of " . Shape::nshapes() . " shapes were created\n"; |
| |
| # ----- Member data access ----- |
| |
| # Set the location of the object. |
| # Note: methods in the base class Shape are used since |
| # x and y are defined there. |
| |
| $c->x = 20; |
| $c->y = 30; |
| $s->x = -10; |
| $s->y = 5; |
| |
| print "\nHere is their current position:\n"; |
| print " Circle = ({$c->x},{$c->y})\n"; |
| print " Square = ({$s->x},{$s->y})\n"; |
| |
| # ----- Call some methods ----- |
| |
| # Notice how the Shape_area() and Shape_perimeter() functions really |
| # invoke the appropriate virtual method on each object. |
| print "\nHere are some properties of the shapes:\n"; |
| foreach (array($c,$s) as $o) { |
| print " ". get_class($o) . "\n"; |
| print " area = {$o->area()}\n"; |
| print " perimeter = {$o->perimeter()}\n"; |
| } |
| |
| # ----- Delete everything ----- |
| |
| print "\nGuess I'll clean up now\n"; |
| |
| # Note: this invokes the virtual destructor |
| $c = NULL; |
| $s = NULL; |
| |
| # and don't forget the $o from the for loop above. It still refers to |
| # the square. |
| $o = NULL; |
| |
| print Shape::nshapes() . " shapes remain\n"; |
| print "Goodbye\n"; |