~$ php -v
PHP 5.3.3 (cli) (built: May 10 2016 21:39:50)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
~$ php -r 'function do_the_price() {global $markup; echo " наценка: $markup\n";} $markup = 1000; do_the_price();'
наценка: 1000