Added phpstan

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+
+### Fixed
+
+- Use `phpstan` as a dev dependency to detect bugs
+
 ## [2.1.0] - 2018-08-04
 
 ### Added
@@ -89,7 +95,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 First version
 
-
+[Unreleased]: https://github.com/middlewares/payload/compare/v2.1.0...HEAD
 [2.1.0]: https://github.com/middlewares/payload/compare/v2.0.0...v2.1.0
 [2.0.0]: https://github.com/middlewares/payload/compare/v1.0.0...v2.0.0
 [1.0.0]: https://github.com/middlewares/payload/compare/v0.6.0...v1.0.0

composer.json

@@ -26,7 +26,8 @@
         "phpunit/phpunit": "^6.0|^7.0",
         "zendframework/zend-diactoros": "^1.3",
         "friendsofphp/php-cs-fixer": "^2.0",
-        "squizlabs/php_codesniffer": "^3.0"
+        "squizlabs/php_codesniffer": "^3.0",
+        "phpstan/phpstan": "^0.9.2|^0.10.3"
     },
     "suggest": {
         "middlewares/csv-payload": "Adds support for parsing CSV body of request"
@@ -43,7 +44,8 @@
     },
     "scripts": {
         "test": [
-            "phpunit --coverage-text --coverage-text",
+            "phpunit --coverage-text",
+            "phpstan analyse --no-progress --level 7 src",
             "phpcs"
         ],
         "cs-fix": "php-cs-fixer fix .",