src/Application.php
protected function setFileExtensions()
    {
        if (!empty($this->args['--file-extensions'])) {
            $exts = array_map('strtolower', array_map('trim', explode(',', $this->args['--file-extensions'])));
            if (!empty($exts)) {
                $this->analyzer->setFileExtensions($exts);
                $this->echoInfoLine('File extensions set to: '.implode(', ', $exts));
            }
        }
    }
protected function setFileExtensions()
    {
        if (!empty($this->args['--file-extensions'])) {
            $exts = array_map('strtolower', array_map('trim', explode(',', $this->args['--file-extensions'])));
            if (!empty($exts)) {
                $this->analyzer->setFileExtensions($exts);
                $this->echoInfoLine('File extensions set to: '.implode(', ', $exts));
            }
        }
    }
Checks --file-extensions argument