}
function mul()
{
return $this->a * $this->b;
}
}
class bar extends foo
{
public $c;
function display()
{
/* alternative display function for class bar */
echo "This is class bar\n";
echo "a = " . $this->a . "\n";
echo "b = " . $this->b . "\n";
echo "c = " . $this->c . "\n";
}
}
$foo1 = new foo();
$foo1->a = 2;
$foo1->b = 5;
$foo1->display();
echo $foo1->mul() . "\n";
echo "-----\n";
$bar1 = new bar();
$bar1->a = 4;
$bar1->b = 3;
$bar1->c = 12;
$bar1->display();
echo $bar1->mul() . "\n";