PHP Memoizer

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A library for memoizing function results in PHP. Allows caching function and method call results for performance optimization.

Installation

composer require kenny1911/php-memoizer

Quick Start

Initialization

use Kenny1911\Memoizer\Cache\InMemoryCache;
use Kenny1911\Memoizer\Memoizer;
use Kenny1911\Memoizer\Normalizer\SimpleNormalizer;

$memoizer = new Memoizer(
    normalizer: new SimpleNormalizer(),
    cache: new InMemoryCache(),
);

Usage in Class

final readonly class Calculator
{
    public function __construct(
        private Memoizer $memoizer,
    ) {}

    public function sum(int $a, int $b): int
    {
        return $this->memoizer->memoize([__METHOD__, \func_get_args()], function() use ($a, $b): int {
            return $a + $b;
        });
    }
}

$calculator = new Calculator($memoizer);

$calculator->sum(1, 2); // Calculates value: 3
$calculator->sum(1, 2); // Returns memoized value: 3

$calculator->sum(3, 4); // Calculates value: 7

Components

Memoizer

The main class for memoization. Accepts two parameters:

• normalizer - normalizer for creating cache keys
• cache - cache implementation

Normalizers

SimpleNormalizer

Converts arguments to a string key using the standard PHP serialize() function. Suitable for most cases.

Cache

InMemoryCache

Stores data in memory during script execution.

Customization

To customize the memoizer, you can write and use your own implementation of a normalizer (interface Kenny1911\Memoizer\Normalizer\Normalizer) and/or cache (interface Kenny1911\Memoizer\Cache\Cache).

Recommendations

1. Use unique keys - include the method name and all relevant parameters in the key
2. Avoid memoizing side effects - memoization is only suitable for pure functions
3. Consider memory usage - especially when using InMemoryCache
4. Test performance - make sure memoization actually provides benefits

License

MIT