There are already community integration projects between GLPI and Zabbix.

https://www.zabbix.com/integrations/glpi

Done in GLPI 9.4 : https://github.com/glpi-project/glpi/pull/4482

Provided solution is not correct and will not be included.

Done in https://github.com/glpi-project/glpi/pull/5738

Development started here : https://github.com/glpi-project/glpi/pull/5725

Check work in progress : https://github.com/glpi-project/glpi/pull/5477