Developing Beautiful,
Measurable Software

First class collections

Doctrine\Common\Collections\ArrayCollection

Collection interface extends
Countable, IteratorAggregate, ArrayAccess

What else can we measure?

• Source lines of code
• Code coverage
• Bug density
• Cohesion and coupling
• Cyclomatic complexity
• Function points
• Custom design constraints

Cyclomatic Complexity

NPath Complexity

public function foo($a, $b, $c, $d)
{
    if ($a) {
        echo 'a';
    }

    if ($b) {
        echo 'b';
    }

    if ($c) {
        echo 'c';
    }

    if ($d) {
        echo 'd';
    }
}
                        

CC = 5 and NPath = 16!

Worst case: NPath = 2^{(CC - 1)}

PHP Quality Assurance Toolchain
by Sebastian Bergmann

PHPLOC by Sebastian Bergmann

• Measures and analyzes a project
• LOC stats per class, method
• Cyclomatic complexity
• Dependencies on methods, attributes
• Code structure

PHP_Depend by Manuel Pichler

• Code analysis and metrics
• NPath and cyclomatic complexity
• Weighted method count
• Coupling analysis
• Code rank
• Dozens of additional metrics

PHP Mess Detector by Manuel Pichler

• Frontend for PHP_Depend
• Code size, complexity
• Design (syntax, classes)
• Unused code
• Naming conventions

PHP Mess Detector by Manuel Pichler

PHP Analyzer by Johannes Schmitt

• Code analysis and fixing
• Type inference
• Suspicious, unused code
• Deprecated functionality
• Coupling and cohesion
• Framework-specific checks

Continuous Integration

jenkins-php.org by Sebastian Bergmann

Continuous Integration

Travis CI

Scrutinizer CI

Scrutinizer CI by Johannes Schmitt

• Automated code analysis
• Code rating
• Tracking changes/stability
• External code coverage
• Automated fixes
• Refactoring tips

Scrutinizer CI by Johannes Schmitt

Beyond Clean Code