PHP APCu Cache (PSR-16)

A tiny, dependency-free APCu cache implementation compatible with PSR-16 (Simple Cache) for PHP. It provides a thin wrapper around APCu functions with sensible key validation and TTL handling.

Features

• PSR-16 compliant interface (get/set/delete/has and multi-operations)
• APCu-backed, in-memory, super fast
• TTL support via integers or DateInterval
• Strict key validation per PSR-16 (forbidden characters: { } ( ) / \ @ : and empty keys)
• Utility to list current APCu cache entries (ApcuCache::getList)

Requirements

• PHP 8.4+
• APCu extension enabled at runtime

Note: The test suite ships with a lightweight APCu polyfill so tests can run without the APCu extension. In production, you must have APCu installed and enabled.

Installation

Install with Composer:

composer require ophelios/php-apcu-cache

Quick start

use Cache\ApcuCache;

$cache = new ApcuCache();

// Set and get
$cache->set('greeting', 'hello world');
echo $cache->get('greeting'); // hello world

// Default value if missing
echo $cache->get('missing', 'default'); // default

// TTL as seconds
$cache->set('token', 'abc', 300); // 5 minutes

// TTL as DateInterval
$cache->set('short', 'value', new DateInterval('PT30S'));

// Existence
if ($cache->has('token')) {
    // ...
}

// Delete and clear
$cache->delete('token');
$cache->clear();

Multi operations

use Cache\ApcuCache;

$cache = new ApcuCache();
$cache->setMultiple([
    'a' => 1,
    'b' => 2,
]);

$values = $cache->getMultiple(['a', 'b', 'c'], 'x');
// ['a' => 1, 'b' => 2, 'c' => 'x']

$cache->deleteMultiple(['a', 'b']);

API notes

• Key validation: Empty keys or keys containing any of { } ( ) / \\ @ : will throw Cache\\Exceptions\\InvalidArgumentException.
• TTL conversion:
  • null means no expiration (APCu 0)
  • 0 is treated as expired (-1 internally)
  • Values > 30 days are converted to absolute timestamps
• Availability: You can check if APCu is enabled using ApcuCache::isAvailable().
• Listing cache: ApcuCache::getList() returns APCu cache entries (best-effort; structure depends on APCu).

Testing

This project uses PHPUnit 10.

Run tests:

vendor/bin/phpunit

Code coverage requires Xdebug or PCOV. If available, you can run:

XDEBUG_MODE=coverage vendor/bin/phpunit

Contributing

Contributions are welcome!

• Open an issue for bugs or feature requests.
• Submit a PR with a clear description and tests.

Dev setup:

• Install dependencies: composer install
• Run tests: vendor/bin/phpunit

License

MIT License © 2025 Ophelios. See LICENSE for details.