@Souheil Mhiri Welcome to the Microsoft Q&A forum, Thanks for posting your question.
To connect your Prestashop 1.7.5.2 website to the Azure MySQL database, you can use PHP code to connect to the database.
You can find a quickstart guide on how to connect to Azure Database for MySQL using PHP
https://learn.microsoft.com/en-us/azure/mysql/single-server/connect-php
Can you please share what is the error you are getting and how you tried to connect?
Regards
Geetha
Thank you very much.
The problem was in Prestashop itself. I've reinstalled it and now it works. Thank you for your help.