$ wp help 
PHP Notice:  Undefined offset: 1 in /var/www/html/wp-includes/vars.php on line 31
PHP Stack trace:
PHP   1. {main}() /usr/local/bin/wp:0
PHP   2. include() /usr/local/bin/wp:4
PHP   3. include() phar:///usr/local/bin/wp/php/boot-phar.php:8
PHP   4. WP_CLI\bootstrap() phar:///usr/local/bin/wp/php/wp-cli.php:23
PHP   5. WP_CLI\Bootstrap\LaunchRunner->process() phar:///usr/local/bin/wp/php/bootstrap.php:75
PHP   6. WP_CLI\Runner->start() phar:///usr/local/bin/wp/php/WP_CLI/Bootstrap/LaunchRunner.php:23
PHP   7. WP_CLI\Runner->load_wordpress() phar:///usr/local/bin/wp/php/WP_CLI/Runner.php:998
PHP   8. require() phar:///usr/local/bin/wp/php/WP_CLI/Runner.php:1061
PHP   9. require() /var/www/html/wp-settings.php:290

$ wp --info
PHP binary:	/usr/bin/php7.0
PHP version:	7.0.8-0ubuntu0.16.04.3
php.ini used:	/etc/php/7.0/cli/php.ini
WP-CLI root dir:	phar://wp-cli.phar
WP-CLI vendor dir:	phar://wp-cli.phar/vendor
WP_CLI phar path:	/var/www/html
WP-CLI packages dir:	/home/vagrant/.wp-cli/packages/
WP-CLI global config:	/home/vagrant/.wp-cli/config.yml
WP-CLI project config:	
WP-CLI version:	1.4.0-alpha-e06a399