Inheritance

mlambert

Hey guys,
Having a poblem with a few classes I've got here. They both extend a single class, however, when I attempt to instantiate them both on the same page, I am getting a redeclaration error, as they both require the use of the superclass, I am really therefore declaring this superclass twice .. e.g. :

require ("C.php") ;
class A extends C {
}

require ("C.php") ;
class B extends C {
}

If I try :
$a = new A() ;
$b = new B() ; //this gives me an error...... I have required("C.php") twice....

Does anyone know a way around this?

ClevaTreva

I suspect you need to use include instead of require. Using include has the advantage that it only runs if the code gets to the line it is on, whereas requires are run regardless of any conditions (like if's).

Trevor

Jeb_

Originally posted by ClevaTreva
Using include has the advantage that it only runs if the code gets to the line it is on, whereas requires are run regardless of any conditions (like if's).

Not so. That hasn't been the case since PHP4.0.2 (see manual page on require). include() and require() are identical except in how they handle failure.

mlambert: You need to use require_once() or include_once(). They ensure that a file is included once and once only - no matter how many times you call it.