Code Analysis with PHP Metrics

Talk at TrianglePHP - https://www.meetup.com/trianglephp/events/238029291/

Transcript

1. Code Analysis with PHP Metrics
2. Presented by Chris Gmyr @cmgmyr
3. Installation composer global require phpmetrics/phpmetrics
4. Generate Report phpmetrics --report-html=myreport /path/of/src
5. Laravel git clone git@github.com:laravel/laravel.git phpmetrics --report-html=laravel_metrics laravel
9. What Are We Going to Learn? 4 Maintainability 4 Violations 4 Complexity 4 Relationships
10. But First, Some Vocabulary! !
11. Cyclomatic Complexity The cyclomatic complexity of a section of source code is the number of linearly independent paths within it. 4 If the source code contained no control flow statements (conditionals or decision points), the complexity would be 1. 4 One IF statement = two paths through the code, complexity would be 2. 4 Two nested single-condition IFs, or one IF with two conditions, would produce a complexity of 3. https://en.wikipedia.org/wiki/Cyclomatic_complexity
13. More Conditionals & Statements = More Complex
14. Lower Score is Better!
15. Halstead Complexity Measures Observation that metrics of the software should reflect the implementation or expression of algorithms in different languages, but be independent of their execution on a specific platform. https://en.wikipedia.org/wiki/ Halstead_complexity_measures http://www.verifysoft.com/en_halstead_metrics.html
17. Lower Score is Better!
18. Maintainability Index Provides a score between 0 to 118. Halstead's metrics, LOC and Cyclomatic complexity number. General scores: 4 <64: low maintainability. The project has probably technical debt. 4 65-84: medium maintainability. The project has problems, but nothing really serious. 4 >85: high maintainability. The project is probably good.
19. Higher Score is Better!
20. Let's Explore!
35. Violations
38. Size & Volume
40. Complexity & Defects
42. Object Oriented Metrics
44. Object Relations
46. Coupling
49. Takeaways 1. More Classes 2. Smaller Classes 3. Simpler Classes 4. Loosely Coupled Classes
50. Thank you!
51. Say "Hi"! twitter.com/cmgmyr github.com/cmgmyr chrisgmyr.com