Skip to content
  • About
    • What is Symfony?
    • Community
    • News
    • Contributing
    • Support
  • Documentation
    • Symfony Docs
    • Symfony Book
    • Screencasts
    • Symfony Bundles
    • Symfony Cloud
    • Training
  • Services
    • Platform.sh for Symfony Best platform to deploy Symfony apps
    • SymfonyInsight Automatic quality checks for your apps
    • Symfony Certification Prove your knowledge and boost your career
    • SensioLabs Professional services to help you with Symfony
    • Blackfire Profile and monitor performance of your apps
  • Other
  • Blog
  • Download
sponsored by SensioLabs
  1. Home
  2. Documentation
  3. Cache
  4. Chain Cache Adapter
  • Documentation
  • Book
  • Reference
  • Bundles
  • Cloud

Chain Cache Adapter

Edit this page

Warning: You are browsing the documentation for Symfony 4.4, which is no longer maintained.

Read the updated version of this page for Symfony 6.3 (the current stable version).

Chain Cache Adapter

This adapter allows combining any number of the other available cache adapters. Cache items are fetched from the first adapter containing them and cache items are saved to all the given adapters. This exposes a simple and efficient method for creating a layered cache.

The ChainAdapter must be provided an array of adapters and optionally a default cache lifetime as its constructor arguments:

1
2
3
4
5
6
7
8
9
use Symfony\Component\Cache\Adapter\ChainAdapter;

$cache = new ChainAdapter(
    // The ordered list of adapters used to fetch cached items
    array $adapters,

    // The default lifetime of items propagated from lower adapters to upper ones
    $defaultLifetime = 0
);

Note

When an item is not found in the first adapter but is found in the next ones, this adapter ensures that the fetched item is saved to all the adapters where it was previously missing.

The following example shows how to create a chain adapter instance using the fastest and slowest storage engines, ApcuAdapter and FilesystemAdapter, respectfully:

1
2
3
4
5
6
7
8
use Symfony\Component\Cache\Adapter\ApcuAdapter;
use Symfony\Component\Cache\Adapter\ChainAdapter;
use Symfony\Component\Cache\Adapter\FilesystemAdapter;

$cache = new ChainAdapter([
    new ApcuAdapter(),
    new FilesystemAdapter(),
]);

When calling this adapter's prune() method, the call is delegated to all its compatible cache adapters. It is safe to mix both adapters that do and do not implement PruneableInterface, as incompatible adapters are silently ignored:

1
2
3
4
5
6
7
8
9
10
11
use Symfony\Component\Cache\Adapter\ApcuAdapter;
use Symfony\Component\Cache\Adapter\ChainAdapter;
use Symfony\Component\Cache\Adapter\FilesystemAdapter;

$cache = new ChainAdapter([
    new ApcuAdapter(),        // does NOT implement PruneableInterface
    new FilesystemAdapter(),  // DOES implement PruneableInterface
]);

// prune will proxy the call to FilesystemAdapter while silently skip ApcuAdapter
$cache->prune();
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
TOC
    Version
    We stand with Ukraine.
    Version:
    Take the exam at home

    Take the exam at home

    Code consumes server resources. Blackfire tells you how

    Code consumes server resources. Blackfire tells you how

    Symfony footer

    ↓ Our footer now uses the colors of the Ukrainian flag because Symfony stands with the people of Ukraine.

    Avatar of uncaught, a Symfony contributor

    Thanks uncaught for being a Symfony contributor

    1 commit • 32 lines changed

    View all contributors that help us make Symfony

    Become a Symfony contributor

    Be an active part of the community and contribute ideas, code and bug fixes. Both experts and newcomers are welcome.

    Learn how to contribute

    Symfony™ is a trademark of Symfony SAS. All rights reserved.

    • What is Symfony?

      • Symfony at a Glance
      • Symfony Components
      • Case Studies
      • Symfony Releases
      • Security Policy
      • Logo & Screenshots
      • Trademark & Licenses
      • symfony1 Legacy
    • Learn Symfony

      • Symfony Docs
      • Symfony Book
      • Reference
      • Bundles
      • Best Practices
      • Training
      • eLearning Platform
      • Certification
    • Screencasts

      • Learn Symfony
      • Learn PHP
      • Learn JavaScript
      • Learn Drupal
      • Learn RESTful APIs
    • Community

      • SymfonyConnect
      • Support
      • How to be Involved
      • Code of Conduct
      • Events & Meetups
      • Projects using Symfony
      • Downloads Stats
      • Contributors
      • Backers
    • Blog

      • Events & Meetups
      • A week of symfony
      • Case studies
      • Cloud
      • Community
      • Conferences
      • Diversity
      • Documentation
      • Living on the edge
      • Releases
      • Security Advisories
      • SymfonyInsight
      • Twig
      • SensioLabs
    • Services

      • SensioLabs services
      • Train developers
      • Manage your project quality
      • Improve your project performance
      • Host Symfony projects

      Deployed on

    Follow Symfony

    Search by Meilisearch