JuniorTheoryCommon

What does the program print?

PHP

<?php

class Counter
{
    public int $value = 0;
}

$a = new Counter();
$b = new Counter();
$a->value += 5;
echo $a->value, ' ', $b->value, "\n";

5 0

Expecting 5 5, as if both variables held one counter: each new builds its own object with its own $value, so changing $a leaves $b at 0.
Expecting an object to be fixed once new has built it: a public property can be changed at any time, and $a->value += 5 makes it 5.

JuniorTheoryCommon

PHP

<?php

class Counter
{
    public int $value = 0;
}

$a = new Counter();
$b = new Counter();
$a->value += 5;
echo $a->value, ' ', $b->value, "\n";

5 0

Expecting 5 5, as if both variables held one counter: each new builds its own object with its own $value, so changing $a leaves $b at 0.
Expecting an object to be fixed once new has built it: a public property can be changed at any time, and $a->value += 5 makes it 5.