If your default php is 7.2 for ex. but your site is with php7.4-fpm, how to use the same php7.4 when using composer for managing the modules?
How to have multiple php? https://www.digitalocean.com/community/tutorials/how-to-run-multiple-php...
How to use them?
Just in virtualhost config use as
<VirtualHost *:80> ... <FilesMatch \.php$> # Apache 2.4.10+ can proxy to unix socket SetHandler "proxy:unix:/var/run/php/php7.4-fpm.sock|fcgi://localhost/" </FilesMatch> ... </VirtualHost>
So, on the topic "Run composer with different php version":
Append in ~/bashrc
alias composer_php74="/usr/bin/php7.4 /usr/local/bin/composer"
execute from ~
use from the project root as
composer_php74 require drupal/mymodule
For sure nobody denied you to run the equivalent
/usr/bin/php7.4 /usr/local/bin/composer require drupal/mymodule
Use what is convenient to you.