On Wed, 2004-04-07 at 17:07, Richard Lewis wrote:
> What do members think that this code should do:
>
> class A
> {
> var $a, $b;
> function A($a)
> {
> $this->$a = $a;
> }
> function prnt()
> {
> echo "<br>a=" . $this->$a;
> }
> }
>
> class B extends A
> {
> function B($a, $b)
> {
> parent::A($a);
> $this->$b = $b;
> }
> function prnt()
> {
> parent::prnt();
> echo "<br>b=" . $this->$b;
> }
> }
>
> $obj = new B("a","b");
> $obj->prnt();
>
> I think it should print
> a=a
> b=b
>
> but it seems to print (on PHP4)
> a=
> b=
Looks like you're suffering from mad dollar disease. You should have the
following instead:
class A
{
var $a, $b;
function A($a)
{
$this->a = $a;
}
function prnt()
{
echo "<br>a=" . $this->a;
}
}
class B extends A
{
function B($a, $b)
{
parent::A($a);
$this->b = $b;
}
function prnt()
{
parent::prnt();
echo "<br>b=" . $this->b;
}
}
$obj = new B("a","b");
$obj->prnt();
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