`composer require --dev squizlabs/php_codesniffer`, then edit composer.json and add
```
"config": {
"bin-dir": "bin"
},
```
Then in `.arclint` add:
```
"phpcs": {
"type": "phpcs",
"include": "(\\.php$|\\.inc$)",
"bin": "vendor/bin/phpcs"
}
```
and run `arc lint`.