Data cache management. Doctrine Cache. Symfony Cache Component. PHP-Cache, Common Pitfalls.

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Data Cache Management
in PHP

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About me
https://www.facebook.com/yatsenco
https://github.com/anyt
about me…
Andrey Yatsenco
● PHP Developer at Oro Inc.
● 3 years with Symfony
● 6 years with PHP

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Data Cache Management in PHP
In this presentation
● Everything about cache
● Full-page cache
● Browser cache. HTTP cache
● Basics about cache
● About data cache
● Common pitfalls

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Data Cache Management in PHP
Cache is the temporary storage where
frequently asked or expensive computed data
can be stored for faster access

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Data Cache Management in PHP
Caching concepts
● Unique cache key
● Lifetime
● Clearing cache data by key

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Data Cache Management in PHP
Cache key
● All data identified by the key
● Key should be unique systemwide
● It’s good idea to use key prefixes
(namespaces)
○ Application namespace
○ Specific data namespace

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Data Cache Management in PHP
Lifetime (TTL)
● Expiration DateTime
● In seconds from save
○ internally DateTime used too

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Data Cache Management in PHP
Clearing cache data by key:
● Key should be unique
● Cache systems should provide ability to
delete data by key

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Data Cache Management in PHP
Why to cache?
● Reduce number of requests to database
● Reduce number of requests to external
resources (API, etc)
● Reduce number of requests to slow storage
(like file system)
● Reduce expensive computing data
recalculation
● You suppose to have high load

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Data Cache Management in PHP
Cache alternatives?
● Code refactoring

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Data Cache Management in PHP
Cache strategies:
● Frontend cache
● Backend cache

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Data Cache Management in PHP
Frontend Cache strategies:
● Page cache in browser
● Offline website cache
● Data cache
○ Cookie
○ Local Storage

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Data Cache Management in PHP
Backend Cache strategies:
● Entire page cache
● Parts of the page
● Opcode-cache
● Store sql-queries result
● Store complex php computing result
● You custom

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Data Cache Management in PHP
In Symfony before using data cache, it’s good
idea to enable default cache that works out of
the box

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Data Cache Management in PHP
Quick speed up Symfony application:
● Production mode for AppKernel
● use AppCache in front controller
● Doctrine Metadata cache
● Doctrine Query cache (not query result)
● composer dump-autoload --optimize
● Enable OpCode cache

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Data Cache Management in PHP
Next: Symfony HTTP cache for shared
pages:
Based on HTTP request headers
● Reverse proxy cache
● ESI cache
● Browser cache
http://symfony.com/doc/current/book/http_cache.html

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Data Cache Management in PHP
When to use Data cache?
● Displays different

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Data Cache Management in PHP
Doctrine Query Result cache
● You need to configure it per query

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Data Cache Management in PHP
Doctrine Query Result cache
● Clearing cache by ID

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Data Cache Management in PHP
Custom Data Cache
● Expensive data computing
● External resources results
● Your custom data

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Data Cache Management in PHP
Custom Data Cache
● Doctrine Cache component
● Symfony 3.1 Cache component (PSR-6)
● PHP-Cache (PSR-6 + steroids)

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Data Cache Management in PHP
Doctrine Cache component
● Use DoctrineCacheBundle to connect
with Symfony '< 3.1'
● Used internally in Doctrine ORM
● Can be used without Doctrine ORM at all

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Data Cache Management in PHP
Doctrine Cache component
Supported providers:
● APC
● CouchBase
● Filesystem
● MongoDB
● Memcache
● Memcached
● Redis
● Riak
● SQLite3
● WinCache
● xCache
● Zend Data Cache

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Data Cache Management in PHP
Doctrine Cache component
Supported providers:
● Array
○ In memory cache that resets every request
● Chain
○ Chain of several caches, from fast and expensive to slow and cheap

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Data Cache Management in PHP
Doctrine Cache component usage example:

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PSR-6 standard
The goal of this PSR is to allow developers to
create cache-aware libraries that can be
integrated into existing frameworks and
systems without the need for custom
development.
Data Cache Management in PHP

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PSR-6 standard
Key concepts:
● Items
● Pool
Data Cache Management in PHP

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Data Cache Management in PHP
PSR-6 standard

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Data Cache Management in PHP
PSR-6 standard

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Data Cache Management in PHP
Symfony cache component (from SF3.1)
https://github.com/symfony/cache
● Strict PSR-6 implementation
● Very simple and fast
● Has doctrine/cache proxy adapter for
advanced features

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Extra cache features
● Tags
○ Tags is used to control the invalidation of items.
● Hierarchy
○ Think of a hierarchy like a file system. If you remove a folder "Foo",
all items and folders in "Foo" will also be removed
Data Cache Management in PHP

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Extra cache features
● Tags
● Hierarchy
Not supported by doctrine or symfony cache
components
● Perhaps will be implemented in
doctrine/cache 2.0
Data Cache Management in PHP

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Extra cache features
● Tags
● Hierarchy
PHP-Cache library (PSR-6)
php-cache.com
Data Cache Management in PHP

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PHP-Cache Tags usage example:
Data Cache Management in PHP

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PHP-Cache Hierarchy usage example:
Data Cache Management in PHP

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Data Cache Management in PHP
Pitfalls
● Premature optimization
● Caching only optimization
● Inability to easy invalidate cache item
● Cache slam
● Relying on cache data
● Inconsistency
● Cache works slower then cache target

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Data Cache Management in PHP
Links:
Psr-6
● www.php-fig.org/psr/psr-6/
Doctrine cache
● http://doctrine-orm.readthedocs.io/projects/doctrine-orm/en/latest/reference/caching.html
● http://symfony.com/doc/current/bundles/DoctrineCacheBundle/index.html
Symfony cache component
● https://github.com/symfony/cache
PHP-Cache project
● http://www.php-cache.com/en/latest/
Sergey Zhuravel presentation about scalability:
● http://www.slideshare.net/sergeyz/scalability-58564573
Vitaly Berdylo presentation about Symfony Performance
● http://www.slideshare.net/vitaliyberdylo/symfony2-performance-issues-and-improvements

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