Example of Usage of UnitEnum, Template and Callable to obtain a "generic function"...

RandomEnumGenerator.php

<?php declare(strict_types = 1);

 /**
  * @template T of \UnitEnum
  * @param class-string<T> $enumType
  * @return callable():T
  **/
function randomEnumGenerator(string $enumType):callable
{
 /** @var array<T> $cases **/ $cases = [$enumType,"cases"]();
 $len = count($cases)-1;
 return fn()=> $cases[rand(0,$len)];
};


enum Direction
{
    case North;
    case South;
    case East;
    case West;
}


$gen = randomEnumGenerator(Direction::class);

var_export( $gen());