Scalable PHP

Scalable PHP Cal Henderson

Oh hai

Does PHP scale?

Stupid question!

Languages don’t scale

Architectures scale

Universe of marshy force. Field sense shallows the hatchery saying Hello,. World!. Hydro. Power spring sometimes; snowmelt powers snowmelt always.

It’s all about the salmon And trees

But PHP sucks

No namespaces

Random function names

No quantum superpositions

People whining

Best of a bad bunch

Ok, scaling What makes something scalable?

Bigger dataset More traffic Maintainable

NOT about performance

But PHP is slow!

Who cares?

PHP is not your bottleneck

More traffic Push issues down the stack

Horizontal vs Vertical

Scale out vs Scale up

Scale out (horizontal) ftw

PHP sessions == bad /var/notshared

Sessions in a DB

No sessions at all

Sessions in cookies

Bigger dataset Not really a PHP issue

Pass big data by function foo(&$big){} reference

Don’t serialize() big things

All arrays are sparse So that’s ok

Don’t keep much in memory

Maintainable Small logical blocks include()

Sucks about namespaces

Classes are like namespaces kinda

Many includes == bad

APC + full paths + nostat == awesome

Set root path via .htaccess ENV Or whatever

deploy-time rollups also good

Consistency is king

# Comments # Also useful # (who knew?)

The bottom line: PHP is used for big things

Beauty is less important Than just working

Photos!
http://flickr.com/photos/isolano/423026153/
http://flickr.com/photos/liberato/171610084/
http://flickr.com/photos/thomashawk/422057690/
http://flickr.com/photos/puja/138469909/
http://flickr.com/photos/stuckincustoms/177496023/
http://flickr.com/photos/maurymccown/289932747/
http://flickr.com/photos/lij/122525716/
http://flickr.com/photos/mr_fabulous/2033276270/
http://flickr.com/photos/re_verse/58362878/
http://flickr.com/photos/auntiep/3990731/
http://flickr.com/photos/arild_storaas/966725616/
http://flickr.com/photos/magnesaxegaard/1351464888/
http://flickr.com/photos/hughes_leglise/530542920/
http://en.wikipedia.org/wiki/Image:John_McCarthy_Stanford.jpg

Moar Photos!
http://flickr.com/photos/bonnieshulman/566022330/
http://flickr.com/photos/hamed/155343130/
http://flickr.com/photos/pandiyan/186171830/
http://flickr.com/photos/fish_at_taipei/198024832/
http://flickr.com/photos/cdell/472665280/
http://flickr.com/photos/robh/142742990/
http://flickr.com/photos/neilw/204239787/
http://flickr.com/photos/big-e-mr-g/152643684/
http://flickr.com/photos/ozyman/155517365/
http://flickr.com/photos/ucumari/580865728/
http://flickr.com/photos/twob/8741933/
http://flickr.com/photos/ashclements/248887492/
http://flickr.com/photos/mr-outdoorguy/2100813932/
http://flickr.com/photos/good_day/450356635/

Even Moar Photos!
http://flickr.com/photos/dcjohn/74907741/
http://flickr.com/photos/carplips/439902567/
http://flickr.com/photos/bretarnett/180654760/
http://flickr.com/photos/bunchofpants/27151349/
http://flickr.com/photos/stuckincustoms/870325399/
http://flickr.com/photos/cruzan/84636294/
http://flickr.com/photos/cayusa/384187184/
http://flickr.com/photos/mrclean/371372515/
http://flickr.com/photos/radiofree/113944690/
http://flickr.com/photos/fortphoto/320676608/
http://flickr.com/photos/hurleygurley/4338767/

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Scalable PHP

by Cal Henderson

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