Prevent duplicate values in custom php.ini
If a session.save_path (and possibly other values already set by ISPConfig) are set using the custom php.ini input there seems to be no check to prevent duplicate values from being set.
Currently without an existing value check the outcome was this:
Notice the two php_admin_value[session.save_path] values
php_admin_value[open_basedir] = /var/www/clients/client1/web1/web:/var/www/clients/client1/web1/private:/var/www/clients/$ php_admin_value[session.save_path] = /var/www/clients/client1/web1/tmp php_admin_value[upload_tmp_dir] = /var/www/clients/client1/web1/tmp
php_admin_value[session.save_path] = /var/www/sessions
By checking for existing values the outcome would have become this:
php_admin_value[open_basedir] = /var/www/clients/client1/web1/web:/var/www/clients/client1/web1/private:/var/www/clients/$ php_admin_value[upload_tmp_dir] = /var/www/clients/client1/web1/tmp php_admin_value[session.save_path] = /var/www/sessions