sevenstepstobetteroopcode

7/21/2019 sevenstepstobetteroopcode

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Seven StepsSeven Stepsto Better OOP Codeto Better OOP Code

Stefan PriebschStefan Priebsch

thePHP.ccthePHP.ccZendCon09ZendCon09


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Stefan PriebschStefan PriebschCo-Founder and Principal ConsultantCo-Founder and Principal Consultant


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Premium PHP Consulting & Training. Worldwide.

ArneBlankerts

SebastianBergmann

StefanPriebsch


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DisclaimerDisclaimer


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Hang the rules.Hang the rules.

he!"re more li#ehe!"re more li#eguidelines an!$a!.%guidelines an!$a!.%

--&li'abeth S$ann(--&li'abeth S$ann(Pirates of the CaribbeanPirates of the Caribbean


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)s **P slo$+)s **P slo$+


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he usual disclaimer for benchmar#s applies,he usual disclaimer for benchmar#s applies,

foofoo /.09 sec/.09 secest11foo /.23 sec

4test-5foo /.62 sec

4test 7 ne$ est84test-5foo .0/ sec


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2:; slo$er,2:; slo$er,


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6 sec6 sec


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he usual disclaimer for benchmar#s applies,he usual disclaimer for benchmar#s applies,

print < 60 sec

file=get=contents < /0 secm!s>l=connect < 600 sec

HP ?& @e>uest < /:(000 sec


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)A* is $here)A* is $herethe action is.the action is.


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**P is**P isfast enough.fast enough.


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Do not care aboutDo not care aboutperformanceperformanceBB

BSome restrictions ma! appl!.BSome restrictions ma! appl!.

66


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hathatdo !oudo !ou

do for ado for a

liEing+liEing+


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class Something public function door# G load data G

G perform calculations G

G render HI output G

G store calculation result ... JJ


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class Something public function doan!hings 4this-5loadData8 4this-5performCalculations8

4this-5renderHtml8 4this-5store@esult8 J

protected function loadData

protected function performCalulations protected function renderHtml protected function store@esultJ


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Clearl! separateClearl! separatedifferent concernsdifferent concerns22


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class Some*bKect protected function loadData 4this-5data 7 4this-5db-5>uer!...8

J

public function render 4this-5loadData8

return Html@enderer11createable4this-5data8 JJ


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Iet othersIet othersdo the $or#.do the $or#.


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class Cr!stalLall public function predictIottoMumbers4a( 4b( 4c

G

return ne$ IottoMumbers...8 JJ


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Focus on the NP)Focus on the NP)//


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)nterface Es.)nterface Es.

)mplementation)mplementation


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Oeep secretsOeep secrets


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class Person

protected function tal# Stranger11as#ForNCigarette8 JJ


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class Person

protected function tal# Stranger11get)nstance-5as#ForNCigarette8 JJ


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class Person protected function tal#oFriend 4friend 4friend-5as#ForNCigarette8 J

J

class Friend public function as#ForNCigarette return ne$ Cigarette8 JJ


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Do not tal#Do not tal#to strangers.to strangers.


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Create loosel!Create loosel!coupled classescoupled classes


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a#ea#e

dependenciesdependencies

eplicit.eplicit.


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J

public function render 4this-5loadData8 return Html@enderer11createable4this-5data8 JJ


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J

public function render@enderer 4renderer 4this-5loadData8 return 4this-5renderer-5createable4this-5data8 JJ


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class Some*bKect protected function loadDataDb?ate$a! 4db 4this-5data 7 4db-5>uer!...8

J

public function render@enderer 4renderer 4this-5loadData8 return 4renderer-5createable4this-5data8 JJ


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class Some*bKect public function ==constructDb?ate$a! 4db( @enderer 4r

4this-5db 7 4db8 4this-5renderer 7 4r8 J

...

J


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Qse dependenc!Qse dependenc!

inKectioninKection::


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class &ngine public function start8

public functoin stop8 public function goFaster4amount8 public function goSlo$er4amount8J


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class Car etends &ngine ...J


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class Steeringheel

public function turn@ight4degrees8 public function turnIeft4degree8J


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class Car etends &ngine etends Steeringheel ...J


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ultiple inheritance+ultiple inheritance+


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&ngine&ngine


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&ngine&ngine

RRSteering heelSteering heel


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&ngine&ngineRR

Steering heelSteering heelRR

SeatSeat


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CombineCombineobKects.obKects.


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CarCar

&ngine&ngine

SeatSeat

SteeringSteeringheelheel


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class Car protected 4engine8 protected 4steeringheel8 protected 4frontSeat8

public function ==construct 4this-5engine 7 ne$ &ngine8 4this-5steeringheel 7 ne$ Steeringheel8 4this-5frontSeat 7 ne$ Seat8

JJ


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class Car public function ==construct&ngine 4engine(

Steeringheel 4steeringheel( Seat 4seat 4this-5engine 7 4engine8 4this-5steeringheel 7 4steeringheel8 4this-5frontSeat 7 4seat8 J

J


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4engine 7 ne$ &ngine84steeringheel 7 ne$ Steeringheel8

4seat 7 ne$ Seat8

4car 7 ne$ Car4engine( 4steeringheel( 4seat8


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4engine 7 ne$ SuperStrong&ngine84steeringheel 7 ne$ Fanc!Steeringheel8

4seat 7 ne$ ichaelSchuhmacher@acingSeat8

4car 7 ne$ Car4engine( 4steeringheel( 4seat8


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FaEour compositionFaEour compositionoEer inheritanceoEer inheritance33


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NEoidNEoidinheritance.inheritance.


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SuperglobalsSuperglobals

ConstantsConstants

SessionSession

ConfigurationConfigurationDatabaseDatabase

ebserEiceebserEice

Class to estClass to est


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)f it"s not tested()f it"s not tested(it does not eistit does not eist

a#e it eas!a#e it eas!


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a#e it eas!a#e it eas!

to unit testto unit test


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Fe$erFe$er

dependencies.dependencies.


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estableestable

77

aintainableaintainable


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estableestable

77&tensible&tensible


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han# !ou.han# !ou.


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