This project contains PHP scripts that will allow you to calculate the complexity of PHP code.
The complexity is calculated based on the following formula:
cognitive complexity * cyclomatic complexity = total complexity
Currently this project only calculates complexitiy at a (class) function level.
In order to calculate the complexity of a given piece of code, call the script on the bin directory:
$ php ./bin/calculate-complexity.php ./src/*.php
File : ./src/CognitiveComplexityScanner.php
Methods : 1 = cy(1) * co(1)
6 = cy(3) * co(2)
File : ./src/CyclomaticComplexityScanner.php
Methods : 1 = cy(1) * co(1)
6 = cy(3) * co(2)
20 = cy(5) * co(4)
I got tired of people having unfounded opinions about what “readability” means.
There is an interesting whitepaper on this topic, which uses the term “Cognitive Complexity”. As I could not find a tool that allowed me to easily calculate both Cognitive and Cyclomatic Complexity in an easy manner, I build one myself.
I’ve basically just combined the logic behind two PHP Code Sniffs:
PHP_CodeSniffer\Standards\Generic\Sniffs\Metrics\CyclomaticComplexitySniffSymplify\CodingStandard\Sniffs\CleanCode\CognitiveComplexitySniffInstead of returning a true/false sort-of response when a given threshold is crossed, I just made the code output a number.
This project has been created by Potherca and is licensed under the GNU GENERAL PUBLIC LICENSE v3 (or higher):
/**
* Copyright (c) 2019 Potherca
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/