BenchDateTimeMap.php

<?php

require 'DateTimeMap.php';

for ($i = 0; $i < 100; $i++) {
    $map = new DateTimeMap();
    for ($j = 0; $j < 100; $j++) {
        $map->set($j, new DateTime());
        $map->get($j);
    }
}

BenchGenericMap_DateTime_.php

<?php

require 'GenericMap.php';

for ($i = 0; $i < 100; $i++) {
    $map = new GenericMap<DateTime>();
    for ($j = 0; $j < 100; $j++) {
        $map->set($j, new DateTime());
        $map->get($j);
    }
}

BenchUntypedMap.php

<?php

require 'UntypedMap.php';

for ($i = 0; $i < 100; $i++) {
    $map = new UntypedMap();
    for ($j = 0; $j < 100; $j++) {
        $map->set($j, new DateTime());
        $map->get($j);
    }
}

DateTimeMap.php

<?php

use DateTime;

final class DateTimeMap
{
    private array $elems;

    public function __construct()
    {
        $this->elems = [];
    }

    public function get(string $key): DateTime
    {
        return $this->elems[$key];
    }

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

GenericMap.php

<?php

final class GenericMap<T>
{
    private array $elems;

    public function __construct()
    {
        $this->elems = [];
    }

    public function get(string $key): T
    {
        return $this->elems[$key];
    }

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

UntypedMap.php

<?php

final class UntypedMap
{
    private array $elems;

    public function __construct()
    {
        $this->elems = [];
    }

    public function get(string $key)
    {
        return $this->elems[$key];
    }

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