Dependency injection with PHP
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Dependency Injection with PHP Nikita Groshin Nguyễn Huy Tuấn
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Speaker: Nikita Work at: CocCoc
Transcript of Dependency injection with PHP
Dependency Injection with PHPNikita Groshin
Nguyễn Huy Tuấn
Itim
More than 200 employees More than 80 developers from different
countries Different programming languages and paradigm Java, C++, PHP, JS, Python etc
Frontend and Tools Deprtment
13 members PHP, JS, Python Kohana, Zend Framework 100% Zend Certificated developers
"Developers! Developers! Developers"
"Dependency! Dependency! Dependency"
Dependencies are suck?
NO. They are useful! Hard code is suck
Good Dependency
Bad Dependency
Bad
Better
Good
Dependency Injection are simple.
Bad
Good
Injection types
Constructor injection Setter injection Interface injection
Interface Injection
Interface injection
Quite easy.But why to use it?
Hard coded dependency
Hard to reuse Poor isolation Hard to test A lot of code Hard to maintain Hard to understand
Dependency injection
Loose coupling Reuse of code Reduce amount of code Clear and Understandable Extremely easy to test
Dependency injection
Loose coupling
Reuse of code
Reduce amount of code
Clear and Understandable
Extremely easy to test
Extremely easy to test
Manual Di management is complicated.
We need container!
Disclaimer
Dependency Injection != DI container DI container use Service Locator Anti-Pattern DI container make code 'less native' Powerful tool – use careful Often Manual injection is enough
How many lines of codewe need for simple
DI container?
Twittee
http://twittee.org/ Packed in less than 140 characters, it fits in a
tweet. Author Fabien Potencier Production ready
Twittee source
Pimple
http://pimple.sensiolabs.org/ 50 lines of code Full functionality Author Fabien Potencier Production ready
