示例#1
0
    }
    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";