DesignPatternsPHP/Behavioral/Strategy/IdComparator.php

<?php declare(strict_types=1);

namespace DesignPatterns\Behavioral\Strategy;

class IdComparator implements Comparator
{
    /**
     * @param mixed $a
     * @param mixed $b
     *
     * @return int
     */
    public function compare($a, $b): int
    {
        return $a['id'] <=> $b['id'];
    }
}