How to make a variable private to a trait?

Question

I\'d like to reuse a functionality several times in a single class. This functionality relies on a private variable:

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Answer 1

Some years down the line, I followed up on a comment in bug 63629 and produced the following:

addresses[substr($calledAs, 3)];
    }

    public function setAddress($address) {
        $calledAs = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1)[0]['function'];
        $this->addresses[substr($calledAs, 3)] = $address;
    }
}
class TestClass
{
    use TestTrait { getAddress as getHomeAddress; setAddress as setHomeAddress; }
    use TestTrait { getAddress as getWorkAddress; setAddress as setWorkAddress; }
}
$c = new TestClass();

$c->setHomeAddress("High Street, Luton");
echo $c->getHomeAddress();
echo "\n";
$c->setWorkAddress("Business Name, London");
echo $c->getWorkAddress();
echo "\n";

which outputs

High Street, Luton
Business Name, London

It can be done! (With thanks to Dave Farrell whose answer inspired this one.) The arguments to debug_backtrace are an attempt to minimize memory usage, I'm not certain how much of an effect on performance that is.