On servers, you can use php (and programs that use php, eg composer) in the appropriate version of php - from 5.6 to 8.0. By default, PHP is run in the version that is the main (default) on a given server (on the new servers the default version is PHP 7.4).
Of course, you can also run any version of PHP with ssh - we have prepared a guide on how to do it: How to install WP-cli
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