src/Application.php
protected function setExcludeList()
    {
        if (!empty($this->args['--exclude'])) {
            $this->analyzer->setExcludedFilesList($excluded = array_map(
                function ($dir) { return trim(strtolower($dir), '/\\ '); },
                explode(',', $this->args['--exclude'])));
            $this->echoInfoLine('Excluding the following files / directories: '.implode(', ', $excluded));
        }
    }
protected function setExcludeList()
    {
        if (!empty($this->args['--exclude'])) {
            $this->analyzer->setExcludedFilesList($excluded = array_map(
                function ($dir) { return trim(strtolower($dir), '/\\ '); },
                explode(',', $this->args['--exclude'])));
            $this->echoInfoLine('Excluding the following files / directories: '.implode(', ', $excluded));
        }
    }
Checks --exclude argument