composer set php version code example

Example 1: check composer php version

composer -vvv about

Example 2: composer require with version

composer require vendor/package:version

composer require refinery29/test-util:0.10.2

Example 3: update composer php version

php7.3 -f /usr/local/bin/composer update

Example 4: composer takes older version of php

composer install --ignore-platform-reqs