Thank you @mrmarkuz for your Howto.
I would suggest a different way for changes to the php.ini configuration:
“max_execution_time” and “short_open_tag” are props already available in the configuration db, so:
config setprop php ShortOpenTag On
config setprop php MaxExecutionTime 0
For other changes I recommend using a separate file /etc/php.d/vtiger.ini with this content:
display_errors = On
error_reporting = E_WARNING & ~E_NOTICE & ~E_DEPRECATED
log_errors = Off
default_charset = "utf-8"
Then run:
signal-event nethserver-php-update
systemctl restart httpd.service