map.php

<?php

class Map
{
    private array $container = [];

    public function __construct(array $data = [], $keyField = null)
    {
        if (!empty($data) && $keyField !== null) {
            $this->setMultiple($data, $keyField);
        }
    }

    public function set($key, $value): void
    {
        $this->container[$key] = $value;
    }

    public function get($key)
    {
        return $this->container[$key] ?? null;
    }

    public function has($key): bool
    {
        return array_key_exists($key, $this->container);
    }

    public function delete($key): bool
    {
        if ($this->has($key)) {
            unset($this->container[$key]);
            return true;
        }
        return false;
    }

    public function clear(): void
    {
        $this->container = [];
    }

    public function size(): int
    {
        return count($this->container);
    }

    public function entries(): array
    {
        return $this->container;
    }

    private function setMultiple(array $array, $keyField): void
    {
        $this->container = array_column($array, null, $keyField);
    }
}