Just use correct path:
# /opt/plesk/php/7.0/bin/php -v
PHP 7.0.5 (cli) (built: Apr 15 2016 12:50:44) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies