PHP: How can I tweak PHPUnit to use a different PHP interpreter?

Question

My system has two PHP interpreters. One came bundled with the OS and the other I installed via the XAMPP package. All of my PHP extensions are applied to the XAMPP installat

Answer 1

Since modifying phpunit file did not work for me because of phar signature errors, I was running phpunit with different php version by calling interpreter explicitly (on Linux):

php7.1 /usr/local/bin/phpunit
php5.6 /usr/local/bin/phpunit

Following the example with XAMPP, full path to php interpreter could be provided:

/Applications/XAMPP/xamppfiles/bin/php /usr/local/bin/phpunit