Dynamic Class Constant
Dynamic class constant access has always been possible with a call to the constant() function. With the class::constant syntax, it is possible to reach any visible constant, or, also, enumeration cases.
A new syntax is available since version 8.3 to do the same: class::{$name}. The curly braces are important in that call.
<?php
enum E: string {
case A = 'abc';
const B = 'def';
}
$name = 'E::A';
echo constant($name)->value;
// PHP 8.3+
echo E::{$name}->value;
$name = 'E::B';
echo constant($name);
// PHP 8.3+
echo E::{$name};
?>