<?php

trait T1
{
    public static $prop1 = 1;
}

trait T2
{
    public static $prop1 = 1;
}

class Base
{
    use T1;
}

class Child extends base
{

}

class Grand extends Child
{
    use T2;
}

$c = new Grand();
var_dump($c::$prop1);

?>