“Connect failed: Access denied for user ‘root’@’localhost’ (using password: YES)” from php function

• mysql -u root -p -h localhost
• CREATE USER 'francesco'@'localhost' IDENTIFIED BY 'some_pass';
• CREATE DATABASE shop;
• GRANT ALL PRIVILEGES ON shop.* TO 'francesco'@'localhost';
• quit;
• mysql -u francesco -p -h localhost
• source shop.sql;
• $conn = new mysqli("localhost", "francesco", "some_pass", "shop");

• Reference :

Reference :
Stackoverflow
Stackoverflow [error 1045]