Constants In Traits

Constants are allowed in traits in PHP 8.3 and more recent. Until then, they were not supported.

PHP code

<?php

trait T {
    const A = 1;
}

class X {
    use T;
}

echo X::A;
?>

Before

PHP Fatal error:  Traits cannot have constants

After

1

PHP version change

This behavior changed in 8.2

Error Messages