Is it possible to implement a shared interface in PHP?

Question

I recently asked a question about resolving dependencies between the unit of work and the Mapper of these classes: Dependency Injection and the unit of work of the template - (which answered Gabor de Mooij - thanks)

At PoEAA, Martin Fowler suggests using the Separated Interface to manage these dependencies. My question is simple - is it really possible to implement this template in PHP or is it specific for Java interfaces? I searched high and low, and it's hard to find links to this template anywhere outside of PoEAA.

Answer 1

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Answer 2

Google? :

http://www.ibm.com/developerworks/opensource/library/os-advphpobj/#N101E7

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interface Exportable {
    public function export();
}

class OurNews extends ThirdPartyNews 
              implements Exportable {
    // ...
    function export() {
        print "OurNews export\n";
    }
}

class Dictionary implements Exportable, Iterator {
    function export() {
        //...
    }
}