area() ."\n"; $s = new Square(10); print " Created square \$s\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 . "," . $s->y . ")\n"; # ----- Call some methods ----- print "\nHere are some properties of the shapes:\n"; foreach (array($c,$s) as $o) { print " ".get_class($o)." \$o\n"; print " x = " . $o->x . "\n"; print " y = " . $o->y . "\n"; print " area = " . $o->area() . "\n"; print " perimeter = " . $o->perimeter() . "\n"; } # Need to unset($o) or else we hang on to a reference to the Square object. unset($o); # ----- Delete everything ----- print "\nGuess I'll clean up now\n"; # Note: this invokes the virtual destructor unset($c); $s = 42; print Shape::nshapes() . " shapes remain\n"; print "Manually setting nshapes\n"; Shape::nshapes(42); print Shape::get_nshapes() ." == 42\n"; print "Goodbye\n"; ?>