[PHP-DEV] interface cannot extend a non interfaced class?

[Erik Franzén]

What is the reason for why PHP5 does not allow creating an interface by 
extending a non "interfaced" class?

The follow code produces an error saying "CMAES_Section cannot implement 
CMAES_DB_Section - it is not an interface in <script>"

/Erik
abstract class CMAES_DB_row {
        public funtion bar {
        }
}
class CMAES_DB_Section extends CMAES_DB_row {
        public funtion foo {
        }
}
interface CMAES_Section extends CMAES_DB_Section {
    public function display();
    public function fetchBoards();
}
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