Composer install phpcs + composer update.

composer.json

@@ -27,7 +27,8 @@
     "require-dev": {
         "zendframework/zend-developer-tools": "^1.1",
         "zfcampus/zf-apigility-admin": "^1.5.9",
-        "zfcampus/zf-deploy": "^1.2"
+        "zfcampus/zf-deploy": "^1.2",
+        "squizlabs/php_codesniffer": "^3.3"
     },
     "autoload": {
         "psr-4": {

composer.lock

 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "ec968e437048d805e7787e06016a2233",
+    "content-hash": "3cbd1097947dc3fb2afda558e1444789",
     "packages": [
         {
             "name": "api-skeletons/zf-doctrine-module-zend-hydrator",
@@ -4449,6 +4449,57 @@
             ],
             "time": "2018-01-24T12:46:19+00:00"
         },
+        {
+            "name": "squizlabs/php_codesniffer",
+            "version": "3.3.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
+                "reference": "6ad28354c04b364c3c71a34e4a18b629cc3b231e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/6ad28354c04b364c3c71a34e4a18b629cc3b231e",
+                "reference": "6ad28354c04b364c3c71a34e4a18b629cc3b231e",
+                "shasum": ""
+            },
+            "require": {
+                "ext-simplexml": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": ">=5.4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0"
+            },
+            "bin": [
+                "bin/phpcs",
+                "bin/phpcbf"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.x-dev"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Greg Sherwood",
+                    "role": "lead"
+                }
+            ],
+            "description": "PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
+            "homepage": "http://www.squizlabs.com/php-codesniffer",
+            "keywords": [
+                "phpcs",
+                "standards"
+            ],
+            "time": "2018-09-23T23:08:17+00:00"
+        },
         {
             "name": "zendframework/zend-code",
             "version": "2.6.3",