Code Analysis with PHP Metrics

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

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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
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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
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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!

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35. Violations

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38. Size & Volume

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40. Complexity & Defects

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42. Object Oriented Metrics

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44. Object Relations

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46. Coupling

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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