As outlined in an earlier article composer php version, when installing the latest version of Drupal the Plesk version and the server version can be different.  In plesk, the version of PHP is 7.3.18, whereas, on the Centos server a check through Terminal (php -v) shows PHP 7.1.33 (cli). When attempting to install Drupal 9 through composer, the following errors will be shown: Problem 1 - drupal/core-composer-scaffold 9.1.x-dev requires php >=7.3.0 -> your PHP version...