Online PHP editor | refs for DDVMF

<?php trait A { protected static $_a; public static function setA($a) { self::$_a = $a; } public static function getA() { return self::$_a; } } class B { use A; public function __construct() { var_dump(self::$_a); } } A::setA('AAAA'); new B(); echo A::getA();