Class properties
-----
<?php

class A
{
    public $a;
    public string $b;
    protected static ?float $c = 5.0;
    private static ?self $d;
}
-----
!!php7
class A
{
    public $a;
    public string $b;
    protected static ?float $c = 5.0;
    private static ?self $d;
}