Building a Singleton Trait with PHP 5.4

Question

We recently had a discussion if it was possible to build a trait Singleton PHP Traits and we played around with it a possible Implementation but ran into issues

Answer 1

Quick solution we've found (thanks chat!):

If a trait and a class both define the same method, the one of class if used

So the Singleton trait only works if the class that uses it doesn't define a __construct()

Trait:

init();
    }
    protected function init() {}
    final private function __wakeup() {}
    final private function __clone() {}    
}

Example for a consuming class:

foo = 1;
        echo "Hi!\n";
    }
}

var_dump(A::getInstance());

new A();

The var_dump now produces the expected output:

Hi!
object(A)#1 (1) {
  ["foo"]=>
  int(1)
}

and the new fails:

Fatal error: Call to private A::__construct() from invalid context in ...

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Demo