Fixing 'Parameter must be an array or an object that implements Count…

[pauljherring]

…able' when handed asdf@asdf

$ php -v
PHP 7.2.10-0ubuntu0.18.04.1 (cli) (built: Sep 13 2018 13:45:02) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.10-0ubuntu0.18.04.1, Copyright (c) 1999-2018, by Zend Technologies

$ php -nr 'include("is_email.php"); echo is_email("asdf@asdf", true, true);'

Warning: count(): Parameter must be an array or an object that implements Countable in [...]/is_email.php on line 1123

After proposed change:

$ php -nr 'include("is_email.php"); echo is_email("asdf@asdf", true, true);'
9