Classes/Objects

[Anon]

I have questions on extending classes. For example:

class A extends B {
function A($x) {
$this -> B($x);
}

if (isSelected == true) {
echo "Hello World";
}
}

class B {
var $y;
function B($x) {
$this->y = $x;
}

function isSelected($selected) {
$same = false;
if ($selected == $y)
$same = true;
}
return $same;
}
}

Would anyone tell me why I cannot use isSelected() in class A? and how to correct it?

Thanks in advance!

Billy

[Anon]

If I read correctly you mean why you can not use the "if (isSelected == true)". It is simply because you have forgotten the "($selected)".

[Anon]

because it's $this->isSelected();

[Anon]

I tried this alos, but php complained "Fatal error: Call to a member function on a non-object"

[Anon]

Sorry, I meant isSelected($selected).

Billy

[Anon]

Billy,

There's a lot wrong with this code. First, vincent is right, you need to have $this->isSelected when refering to the isSelected method.

Second, your IF is not inside a method. There are only two valid statements you can make inside a class definition: var and function. All other statements and functions MUST be within method functions.

Third, remove the extra two } in the isSelected method in Class B. You should have only one } at the end. The IF statement there does not have an opening { (and doesn't need one since you only have one statement executing on the conditional.

Fourth, the class definition for A needs to be after the class definition for B since A extends B, B has to be defined first.

[Anon]

your IF is not inside a method. There are
only two valid statements you can make
inside a class definition: var and
function. All other statements and
functions MUST be within method functions.

A-ha! I thought I could use the IF statement anywhere inside the <?php ... ?> block like JSP. This is my major wrong here.

Thanks a lot!

Billy