PHPのConstの中でConstを使う

Constant.php

<?php

class Constant {
	const MEW = "Mew";
}

UseConstant.php

<?php

require_once __DIR__ . "/Constant.php";
class UseConstant {
	const USEMEW = [
		Constant::MEW,
	];

	public function mew(){
		var_dump(self::USEMEW) . PHP_EOL;
	}
}

$a = new UseConstant();
$a->mew(); // shows [ "Mew" ]