passing a DI container with a trait

<?php

trait A {

    protected static $container = 1;
    public static function setContainer($c){
        self::$container = $c;
    }
}

class C{
    use A;

    public function foo(){
        var_dump(self::$container);
    }
}


A::setContainer(2);

$c = new C();

$c->foo();