User.php

<?php 

// 1.
$isUserModerator = $user->isType(‘moderator’);

class User {

    // . . . 
    public function isType(string $type): bool
    {
        return $this->type === $type;
    }
    // . . .
}

// 2.
$isUserModerator = $user->isModerator();

class User {

    // . . . 
    function isModerator(): bool
    {
        return ‘moderator’ === $user->type;
    }
    // . . .
}

// 3.
$isUserModerator = $user->isType(User::TYPE_MODERATOR);

class User {
    public const TYPE_MODERATOR = ‘moderator’;
    // . . . 
    public function isType(string $type): bool
    {
        return $this->type === $type;
    }
    // . . .
}