How to set php version for multiple websites

[xiaomo]

as title
I already have an idea, but I don't understand how the Address in the LiteSpeed SAPI App is set

 

[Cold-Egg]

PHP version per virtual host or do you mean PHP version per directory?
Per virtual host, please check https://docs.openlitespeed.org/configuration#set-up-php-at-the-virtual-host-level
Per directory, please check https://openlitespeed.org/kb/setup-per-directory-file-php/