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Guitar implements IMusician interface 
interface IMusician {
    public function play();
}

class Guitarist implements IMusician {
    public function play() { 
        echo "playin a guitar";
    }
}
In this example 
Guitarist
child class has to define 
play()
method because the child class implements interface 
IMusician
that has the method signature
by Valeri Tandilashvili
4 years ago
PHP
OOP
1
Pro tip: use ```triple backticks around text``` to write in code fences