The document outlines best practices for scaling PHP applications, emphasizing the use of the latest PHP version and the importance of fine-tuning the php.ini configuration. It discusses session management strategies for horizontal scaling, including persistent load balancing options and caching mechanisms like memcache and APC. Additionally, it advises on managing technical debt related to database choices and connection settings.

1. Scaling PHP
Lucas Arruda
lucas@ciandt.com
@lunascarruda
Handrus Nogueira
handrus@taller.net.br
@handrus

2. Lucas Arruda
Based on Campinas-SP
Software Architect @ CI&T
Open-Source enthusiast
~10 yrs on the road
Zend Certified Engineer PHP 5.3
Google Cloud Platform Qualified Dev.
Drupaler for 4 yrs

3. Handrus
Based on Bauru-SP/Florianópolis-SC
Software Architect / Dev @ Taller
Open-Source and Agile
~10 yrs on the road
Drupaler for 3 yrs

4. The Basics

5. Use the latest PHP stable version

6. Use the latest PHP stable version

7. Disable unnecessary PHP extensions and web-server modules
● PHP extensions consume memory heap
● Some badly written can cause memory leaks
● The same applies for web-server modules
● Disable if you don’t need them!

8. Fine tune your php.ini!
● memory_limit
memory_get_usage() / memory_get_peak_usage()
● realpath_cache_size
realpath_cache_get()
● realpath_cache_ttl
Max execution per thread - will affect memory usage!

9. mod_php
vs.
FastCGI
vs.
PHP-FPM

10. ob_flush()
flush()
?

11. PHP ACCELERATORS

12. Alternative PHP Cache (APC)
Zend OPcache
XCache

13. APC OPcache XCache

15. Zephir

16. Scaling PHP
Horizontally

17. Does your app use
session data?
No: you’re good to go!
Yes: then you’ll need to
manage this data across
multiple servers.

18. Sharing session data
Fault tolerant
No bottleneck
Cheaper
buut… it needs architecure changes!
PHP Session
Management
Persistent load balancing
Sharing session data
Persistent load balacing
Single point of failure
Bottleneck
Expensive

19. Options
Shared file-system
Database
Memcache / Redis
Sharing
session data
session.name
session.save_handler
session.save_path
Handlers
files
user
memcache

20. Avoid database specific
queries.
Good libraries can help
(Doctrine FTW!)
If not possible
Document like any
Technical Debt!

21. And choose well
your database!!
● MySQL
● MariaDB
● PerconaDB
Version?!

23. paths timezone connection string
limits
timeouts
API Keys Number of tries
How dependent of your actual
environment are you?

24. Caching Mechanisms

25. APC
for caching user data
Memcache
for key/value storage (URI/HTML?)
tmpfs/ramfs
for all file-based caching

26. Reverse proxying
Nginx Varnish

28. ...

29. Q&A
ciandt.com

30. THANKS
FOR
BEING
HERE!
Please evaluate this presentation!
http://goo.gl/P8ZDfc
(3 questions only)

31. @lunascarruda
lunascar@gmail.com
google.com/+LucasArruda
fb.com/lucasnarruda
linkedin.com/in/larruda
github.com/larruda
coderbits.com/larruda
@handrus
handrus@gmail.com
google.com/+HandrusNogueira
fb.com/handrus
linkedin.com/in/handrus
github.com/handrus
coderbits.com/handrus