My webhoster only allows to configure PHP scripts for cronjob command. How can I set up the ASA2 cronjobs with such webhosters?

As the ASA2 script.sh executes a PHP script internally, you can execute that PHP script directly and use it for your cronjob.

The syntax is:

php -f [path-to-asa2-dir]/lib/IfwAsa2/Wp/Plugin/Cli/Executables/script.php -- "[path-to-asa2-dir]" Asa2_Module_Repo_Cron_Refresh

[path-to-asa2-dir] should be your webserver's local path to the ASA2 plugin directory. 

You can append all options documented at http://docs.getasa2.com/cronjobs_repo_refresh.html

Example

php -f [path-to-asa2-dir]/lib/IfwAsa2/Wp/Plugin/Cli/Executables/script.php -- "[path-to-asa2-dir]" Asa2_Module_Repo_Cron_Refresh -lt=3600 --limit=50